improved docs

Slightly improved documentation, just to make it a bit more clear.
Merge pull request #103 from fernandohur/patch-1

improved docs
Added setBasicAuth method to override global credential
Merge pull request #104 from paolocasarini/basicauth-patch

Added setBasicAuth method to override global credential
Add BuildConfig collector

Add a new collector the reports the values of the constants defined on the application's BuildConfig class. This class contains customizable information with the new gradle build system.
Dotting the Is on the BuildConfig attribute changes.
Merge branch 'manualinit' of https://github.com/johncarl81/acra
Apply ACRAConfiguration in init
Introduced manual non-annotation based init methods and associated configuration builder.
Merge remote-tracking branch 'xeno/master' into manualinit

Conflicts:
	src/main/java/org/acra/ACRA.java