PDF build fixes.

Fixes some errors on PDF generation with Sphinx.
PDF trainining doc fixes.

Page breaks to fix PDF generation.
Merge pull request #45 from alediator/pdf_fixes

Pdf fixes
close #46
User Manual docs

* New style for the user manual
* Add more text to training docs to generate the manual
* Page break fixes
Merge pull request #55 from alediator/user_manual

User Manual docs
Administrators Manual

Docs for the admin manual.
Merge pull request #56 from alediator/admin_manual

Administrators Manual
close  #60
update admin manual  #60
fix admin links in training. close #58
add notes about special NDVI_avg factor and fixed url to admin
close #64
close #65
close  #57