Update PDF broken and sharing fixes

[pierrealixt]

this fixes #527

I consider this pull request more like a patch. This code could be refactored a lot more.

I made sure I didn't write too much code to avoid new bugs. That's why I wanted to use the same code used to search:

• campuses in api_views/campus.py
• courses in api_views/course.py
• favourites in views/api.py (ApiSavedCampus).

The share bar (pdf, email, twitter, link, embeded) is now displayed on all map views except when there is no result. Added to the PDF: search filters (options: field of study, qualification type..) Added to the PDF: the url with search query and options. The url is for the moment hard-coded.

I'll open an issue for each of those

• PDF's name is feti.pdf.
• PDF's content has bugs and could be improved: some campus dont have an address; pdf of courses doesn't look good; map is too big
• upgrade pip
• pep8 -> pycodestyle -> travis
• fix the test suite: there are 5 skipped tests.
• email share might be broken, I haven't yet received my email from http://159.69.42.250:63100/

[cchristelis]

@pierrealixt, I'm happy with merging this to get the PDF available on staging.