Making some small changes to Wireless Challenges, adding FR version docs and images.
Further cleanup and updates to English and French versions of Wireless Challenges module. Corrected some images. Final upload of French version of PDF presentation and problem sets.
Added some files.
Added "pretty print" versions of the Wireless Challenges page in both English and French.
Merge branch 'staging' of github.com:opentechinstitute/commotion-docs into issue-195
Merge pull request #210 from opentechinstitute/issue-195

Issue 195 - Fixing broken links in French version of Wireless Challenges
Merge pull request #213 from opentechinstitute/staging

These changes look good.

Fixes to Wireless Challenges CCK module PDFs and French langauge materials