First try to replace all application and apps with project

Still TODO:
Replace application/apps in translations and there refs!
Review application and app in test python files!
Merge branch 'master' into issue-531-rename-apps-v2
Merge branch 'master' into issue-531-rename-apps-v2
rename 'Create an app'
rename somre more applications
point to new pybossa js
replace app with project in strings for translation
merge master and fix merge conflicts
point to new pybossa.js
Merge branch 'issue-531-rename-apps-v2' of https://github.com/PyBossa/pybossa-default-theme into issue-531-rename-apps-v2
rename application to project
missed a renaming
Merge pull request #33 from PyBossa/issue-531-rename-apps-v2

Fixes #531