Add documentation about writing an html activity
Make html build optional

On fedora jekyll is not packaged.
Fix a few missing escapes
Merge pull request #3 from dnarvaez/build

Build fixes
Merge pull request #4 from dnarvaez/activity

Add documentation about writing an html activity
Move Contributing section from sugar readme
Improve contributing section, content and format
HTML activities: add information about updating of deps
Merge pull request #6 from manuq/addcontributing

Move Contributing section from sugar readme
Merge pull request #7 from manuq/activities

HTML activities: add information about updating of deps
Add file structure
Add note about making an XO and upload to ASLO
Merge pull request #8 from manuq/filestructure

Add file structure
Remove wrong inline format
Add activity template image
Merge pull request #10 from manuq/template

Add activity template image
Remove suggestion to git pull

We are now doing it automatically on make pull.
Merge pull request #11 from dnarvaez/nopull

Remove suggestion to git pull
Merge pull request #9 from manuq/formatfix

Remove wrong inline format
Switch to debian jessie