build project with gradle

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http://tools.android.com/tech-docs/new-build-system/user-guide

todo :

• build app -> 'gradle assemble'
• code analysis : pmd, cpd, checkstyle, lint
• run (unit) tests -> 'gradle check'
• code coverage (cobertura (not compatible with, emma (not available yet), jacoco?), see also #172
• publish coverage on coveralls, see also #172
• implement on Jenkins
• implement on Travis
• implement on F-droid (release)
• code documentation (javadoc) : http://stackoverflow.com/questions/17033878/generate-javadocs-with-android-gradle-plugin and https://github.com/ReadyTalk/swt-bling/blob/master/build.gradle

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use gradle wrapper : http://www.gradle.org/docs/current/userguide/gradle_wrapper.html

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deploy to android device and start from command line : https://stackoverflow.com/questions/17326162/can-you-deploy-to-a-device-via-gradle-from-the-command-line-in-android-studio

[ruleant]

#176