Not sure, maybe not related, but at least not synchronized with info in package.json.
I'm haiving troubles with fetching c3 0.4.11 and it tells me:
```
$ bower install
bower c3#0.4.11 not-cached https://github.com/masayuki0812/c3.git#0.4.11
bower c3#0.4.11 resolve https://github.com/masayuki0812/c3.git#0.4.11
bower c3#0.4.11 checkout 0.4.11
TypeError: LRU: key must be a string or number. Almost certainly a bug! undefined
at typeCheckKey (C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\node_modules\lru-cache\lib\lru-cache.js:20:19)
at LRUCache.get (C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\node_modules\lru-cache\lib\lru-cache.js:230:3)
at C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\lib\core\resolvers\GitRemoteResolver.js:122:70
at _fulfilled (C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\node_modules\q\q.js:854:54)
at self.promiseDispatch.done (C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\node_modules\q\q.js:883:30)
at Promise.promise.promiseDispatch (C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\node_modules\q\q.js:816:13)
at C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\node_modules\q\q.js:877:14
at runSingle (C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\node_modules\q\q.js:137:13)
at flush (C:\Users\andrii.lundiak\AppData\Roaming\npm\node_modules\bower\node_modules\q\q.js:125:13)
at _combinedTickCallback (internal/process/next_tick.js:73:7)
bower c3#0.4.11 resolved https://github.com/masayuki0812/c3.git#0.4.11
bower c3#0.4.11 install c3#0.4.11
```
And I thought, it might be related....
cleared unused commented test case and cleared up spelling errors.
#2251 fixed testcase and somehow removed return statement.
#2251 x-axis tick format is no longer truncated for negative values.
#2251 x-axis tick format is no longer truncated for negative values.
commit 547311d30c
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Fri Jun 23 14:35:09 2017 +0200
for multi-arc-gauge the radius has changed to let the label fit in the chart
commit 43ba49dd15
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Fri Jun 23 13:00:29 2017 +0200
fixed warnings of travis check
commit 7f5a025de4
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Thu Feb 4 15:14:34 2016 +0100
rebased, conflict resolved, bugfixed, refactored and tests added
commit 013f0666a7
Merge: ff175d1c343243
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Fri Jun 23 12:40:39 2017 +0200
Merge remote-tracking branch 'upstream/master' into feature/multi-arc-gauge
# Conflicts:
# src/arc.js
# src/data.js
commit ff175d15ea
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Thu Feb 4 15:14:34 2016 +0100
optimized position of arc label line
commit 0bf2cefff3
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Thu Feb 4 14:44:50 2016 +0100
wrong tooltip position for gauges fixed
commit 155c08c045
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Thu Feb 4 14:49:25 2016 +0100
also hide arc label line when gauge_label_show is false
commit e145b5c2a5
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Fri Aug 28 09:36:31 2015 +0200
draw line from arc end to its label to highlight the relation
commit 28616bf810
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Fri Aug 28 09:36:31 2015 +0200
add background for every single arc
commit cb2aaf1672
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Fri Aug 28 09:36:31 2015 +0200
label placement for more than one arc
commit 6ecc609878
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Fri Aug 28 09:36:31 2015 +0200
gauge_arcs_minWidth property to determine the minimal width of gaugearcs until the innerRadius disappears
commit 5689dee384
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Thu Aug 27 10:24:18 2015 +0200
visibleTargetCount for cleaner arc calculation
commit 9a2686c37f
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Thu Aug 27 10:21:13 2015 +0200
more than one arc are possible for gauges
commit 0866234001
Author: Gökhan Özen <Goekhan.Oezen@hksinformatik.de>
Date: Mon Aug 10 17:07:48 2015 +0200
show legend for gauges which have more than one arc