relaxed schema
dropped a rexgex replace target

covered by ts_clean
fixed bug in NameMatcher

allows selecting whole project:
- angularjs/
dropped graceful-fs, fixed cache pruning

fixed CacheLoader cleanup
- reworked logic to remove empty directories

ditched graceful-fs dependency for regular fs
npm auto-re-ordered package.json
added rimraf dependency
dropped graceful-fs typings, added rimraf typings
reworked blob handling

less memory leakage

dropped old DefBlob model
- removed blob-handling from DefIndex
- re-added DefBlob as simple associated
- ContentLoader uses lru-cache with limited max-size

added lru-cache dependency and typings
optimized behavior of http, cache loading & resolver

limit max connections
- added max concurrency loading limit to HTTPCache
- added `concurrent` option to HTTPOpts
- added `concurrent` setting support to GithubLoader via settings.json

works in tandem with ContentLoader's LRU cache

tuned ContentLoader to try to use HEAD by default
tuned settings.json
fixed Resolver deadlock

dropped borky promiseUtils
updated fixtures to work with loader changes