Added page for template downloads

Ref #227
cleaning txt
Adding instructions on adding new pages
syntax fix
Merge pull request #238 from VirtualFlyBrain/Dev-Server

Adding editing guide and framework for template download page
correcting wording
Swapped to GNU v2 from MIT

As was the stated licence previously
Merge pull request #239 from VirtualFlyBrain/Dev-Server

clearing up licensing contradiction
Correcting voxel size
Revert "Correcting voxel size"

This reverts commit 1730d3aa8ce26ab7c7d3a7680b7a870780cc1e7b.
Moved BrainName section to Template tab.
Merge pull request #241 from VirtualFlyBrain/master

updating download page info