User manual pdf generation. Menu options for user guide and feedback

[tanmaykm]

This will add:

• a help menu with options
  • Circuitscape User Guide : opens a browser window pointing to 4.0 user guide at github
  • Discuss / Provide Feedbacks : opens a browser window to the support page at http://www.circuitscape.org/Support which has the google groups widget embedded
• a doc target to the makefile that generates a pdf version of the user guide from the markdown file. The pdf can be generated with make doc command. I have also checked in the pdf to github, as we may want to point to it from elsewhere.
• auto generates the .rst format README file required for registering python package.

The document format conversions need the pandoc utility which can be installed from http://johnmacfarlane.net/pandoc/installing.html.

[bmcrae]

Thanks for this. Would be nice to eventually have a Windows-compatible Makefile (unless there is a Windows version of Make that can deal with linux command separators and other things; I'm using GNU make). But all looks very good to me, will merge.

[bmcrae]

Actually, no need for a Windows makefile.