add `void setBuildConfigField(buildType, map)`
Merge branch 'master' of https://github.com/gfx/gradle-android-utils into add-setBuildConfigField
add unit test for setBuildConfigField()
Merge branch 'master' into add-setBuildConfigField
fix file format
Merge pull request #7 from ichigotake/add-setBuildConfigField

add `void setBuildConfigField(buildType, map)`