remove duplicate build dir

Added a flexibility parameter, --strictness, you can now specify not to care about exit codes, or the 'failed|error|...' regex.

make repo classes available inside config file without explicit import

update readme to reflect changes already made in develop branch

extended sanity check

Conflicts:
	easybuild/framework/application.py

Add os deps check for dpkg systems

Repositories are created in the config now. 

Conflicts:
	easybuild/easybuild_config.py