derive version from git tags
breaking change: support only scoverage 1.0+
add runtime dependency to test project
runtime dependency not required for compiling the plugin
1) instrumentation requires a single plugin jar and the runtime jar must be also be supplied on the classpath
2) testing instrumented code does not require the plugin jar
3) reporting on coverage files requires all scoverage jars.
Merge remote-tracking branch 'scoverage/master' into scoverage-master

Conflicts:
	gradle.properties
Merge pull request #21 from maiflai/scoverage-master

Support scoverage 1.0