Merge pull request #7 from pdehaye/master

Added a bit to WP databases
typo
Attempt at improving the first sentences
LaTeX fixes
Added deadlines
Updated pdf
typos and minor edits
Further little improvements to the first paragraphs
Consistency
Factored out some sustainability material into Objective 5 (sustainable ecosystem of components)
Create readme.txt
creation of Participants/Bordeaux.tex
Add Cython community feedback to the Pythran WP
Merge branch 'master' of https://github.com/sagemath/grant-europe