whitespace fixing
added buildininstalldir option to easyconfig
Merge branch 'develop' into build_in_install_dir

Conflicts:
	easybuild/framework/easyconfig/default.py
sort easyconfig parameters alphabetically per group, fix merge conflict resolution
complete merge
add unit test for buildininstalldir easyconfig parameter
Merge pull request #794 from boegel/build_in_install_dir

add buildininstalldir easyconfig parameter with unit test + style fixes