rearranged extensions on extend page
fix to init error in select from server modal
Merge pull request #1896 from jadwigo/boltcamp-three-extend

rearranged extensions on extend page
Merge pull request #1897 from rossriley/fix-async-files-js

fix to init error in select from server modal
Working on refatoring choosing of templates
visual improvements to extend page for installed extensions
Merge remote-tracking branch 'upstream/master' into boltcamp-three-extend
Allow for theme's config.yml to override template settings. Fixes #1869
some comments and cleanup
Merge pull request #1898 from jadwigo/boltcamp-three-extend

update extend screen with tags and icons
Herp Derp.
Minor tweak to Templatechooser.
Update Bolt's composer autoloader to use PSR-4
Merge pull request #1899 from GawainLynch/hotfix/psr-4

Update Bolt's composer autoloader to use PSR-4