Merge pull request #5 from boegel/fixes

tweaks on landing page, fix lists in Writing easyconfigs
Merge pull request #6 from boegel/fixes

tweaks in concepts and intro pages
fix minor issues in 'Using ...' page
bugfixing logfiles.rst

Signed-off-by: Fotis Georgatos <fotis@cern.ch>
Merge branch 'develop' of github.com:fgeorgatos/easybuild into fixes
moar minor edits