Support tarvis #53
Squashed commit of the following:

commit a743261248d700037b372aaa799ef0fb504f9bc9
Author: in_dow <in_dow@hotmail.com>
Date:   Wed Jan 1 04:57:41 2014 +0900

    Fixes lint errors

commit 7c31af30604876e373127aed54e99a368285c450
Author: in dow <in_dow@hotmail.com>
Date:   Sat Dec 28 21:50:24 2013 +0900

    Fix error by setting

commit 05c963919ac7aec9975b966f76cfbc9e2238f4c5
Author: in_dow <in_dow@hotmail.com>
Date:   Sat Dec 28 02:45:37 2013 +0900

    Fix build matrix

commit c4b16279d5fe739d2577ed64a167ed0172c9f952
Author: in_dow <in_dow@hotmail.com>
Date:   Sat Dec 28 02:41:02 2013 +0900

    Fix release signing

commit 5c7688549091eba716673284bd9a089f820c12b8
Author: in_dow <in_dow@hotmail.com>
Date:   Sat Dec 28 02:02:27 2013 +0900

    Fix signing dependency

commit 516eaca5082b4e6d93f25716e9778bc96a91d542
Author: in_dow <in_dow@hotmail.com>
Date:   Sat Dec 28 01:35:12 2013 +0900

    Upgrade java version from 6 to 7

commit c94eaf6a1663312a9726ae5667579c7fda106dd7
Author: in_dow <in_dow@hotmail.com>
Date:   Sat Dec 28 01:24:53 2013 +0900

    Fix error on rename the folder

commit a3cc37acd1ab9ff574cb85659cff52bfdeb4a41e
Author: in_dow <in_dow@hotmail.com>
Date:   Sat Dec 28 01:14:10 2013 +0900

    Fix dependency

commit 0923bc15909077ab7c991112924695c1f4334743
Author: in_dow <in_dow@hotmail.com>
Date:   Sat Dec 28 01:13:52 2013 +0900

    Fix build error on travis build tool error