l10n 0.14.0

Creates translatable PO-Files, strong orientation to xgettext

###Changes:###

• Short documentation for 'how to use' the gradle tasks (d76e5c6)
• Forgot to write the CL (f068808)
• Gradle can update the version in pubspec.yaml and can write a CHANGELOG.md (e3a5709)
• build.gradle added (c0d4c60)
• JSON-Capabilities for L10N (8e9b363)
• README updated (dd078a6)
• README updated (648494b)
• README updated (0e33ee8)
• Subtranslations are possible (8fb2868)
• PO-File gets initialize with utf-8 per default (not the case with original msginit) (a6539ce)
• Set constraint for intl (de67f74)
• Removed dependency_override (d9a051a)
• README updated (cf0d7fd)
• Gave up with 'pub global..., added a working solution to README' (a27fd93)
• pub update takes quite long - searching for the problem (65e6b15)
• Playing with sdk 1.6 (e37b4fc)
• README updated (d79d784)
• Wrong locale in Application... (73781ea)
• 'locale-dir' was not in git (39c80c0)
• README (Typo) (5451168)
• README again (9bf3e81)
• Install added to README (92ae57c)
• Install added to README (c6513ee)
• Install added to README (f02b841)
• Screenshot (b4158fa)
• Screenshot (01a0c2d)
• Screenshot (fb1a8f5)
• mini-Sample and README changed (e0a6d04)
• mini-Sample and README changed (25c7b20)
• mini-Sample and README changed (d60861f)
• Some more tests (55a90cc)
• Added some comments... (e212f45)
• Dart-File creation works (b538065)
• Test for merge (c4e3b6a)
• Remove locale from git (6efa4bd)
• Tests... (ec29f92)
• Nice... (8a21605)
• Creation of JSON-File works (a5c7d9f)
• Mit extract-pot gestartet (af92982)
• Umstellung von variables auf vars (40b585f)
• funkt mit const L10 (cfedc91)
• Tests mit const-Konstruktor (c0e2180)
• fromJson construktor umgebaut - zum Testen von const-Konstruktor (391ebab)
• Initial release (733b7f4)