Update some "dependencies" (builds tools) and increase target/compile version

[StefMa]

Title says everything..

I haven't it tested yet :D

[StefMa]

Just have tested it. Sample works fine. Uploading to bintray also (see https://bintray.com/stefma/maven/Tray). Seems to be working 😄

Additional tests needed? @passsy

[codecov-io]

Codecov Report

Merging #107 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             master   #107   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity      274    274           
=======================================
  Files            22     22           
  Lines           670    757   +87     
  Branches         60     60           
=======================================
+ Hits            670    757   +87

Impacted Files	Coverage Δ	Complexity Δ
...a/net/grandcentrix/tray/provider/TrayContract.java	100% <0%> (ø)	11% <0%> (ø)	:arrow_down:
...a/net/grandcentrix/tray/provider/SqliteHelper.java	100% <0%> (ø)	17% <0%> (ø)	:arrow_down:
...dcentrix/tray/provider/ContentProviderStorage.java	100% <0%> (ø)	32% <0%> (ø)	:arrow_down:
...grandcentrix/tray/provider/TrayProviderHelper.java	100% <0%> (ø)	21% <0%> (ø)	:arrow_down:
...n/java/net/grandcentrix/tray/provider/TrayUri.java	100% <0%> (ø)	4% <0%> (ø)	:arrow_down:
...grandcentrix/tray/core/AbstractTrayPreference.java	100% <0%> (ø)	19% <0%> (ø)	:arrow_down:
...main/java/net/grandcentrix/tray/core/TrayItem.java	100% <0%> (ø)	8% <0%> (ø)	:arrow_down:
...n/java/net/grandcentrix/tray/core/Preferences.java	100% <0%> (ø)	46% <0%> (ø)	:arrow_down:
...randcentrix/tray/provider/TrayContentProvider.java	100% <0%> (ø)	35% <0%> (ø)	:arrow_down:

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