only print the os version is present
added appledoc target
print output when exit code != 0 at appledoc
added code coverage using gcovr
fixed issue #72
added that coverage config can be passed with -P
changed variable names
Merge branch 'master' of github.com:openbakery/gradle-xcodePlugin
Merge branch 'develop'
renamed varables to avoid name conflicts
added new line after summary