easyconfig management

[bmcgough]

commit triggers:

add easyconfigs to .gitattributes file with attribute fh_built set
re-generate gh-pages json file using fh_built attribute and full easyconfigs repo
use jstree to display json of all easyconfigs, indiciating which we have built, and allowing users to select and request builds/ask questions

[fizwit]

package builds are still manual but the following changes have been made.
Github Pages created to document all Hutch build modules.
Software requests are created as github issues, the issues are labeled.