Fix TaskObserver for json endpoint usage.

Testing Done:
The `/j/task?task_id=id1,id2,...` endpoint now works.

Reviewed at https://reviews.apache.org/r/23211/
Move license header to inner node in angular fragments.

Bugs closed: AURORA-563

Reviewed at https://reviews.apache.org/r/23238/
Instruct quartz to use all daemon threads.

Bugs closed: AURORA-560

Reviewed at https://reviews.apache.org/r/23219/
Export a stat to track number of LOST gc_executors

Bugs closed: AURORA-562

Reviewed at https://reviews.apache.org/r/23180/
Configure H2 to use a named (non-private) database, and not close the database.

Bugs closed: AURORA-573

Reviewed at https://reviews.apache.org/r/23273/
AURORA-278 - Remove binaries from source RC

Testing Done:
./builds-support/release/release-candidate -r 1 -l m

verified gig sig, md5, sha, untared release and looked for binary artifacts.

Additional review opened to address missing headers

Bugs closed: AURORA-278

Reviewed at https://reviews.apache.org/r/22983/
Merge branch 'master' of github.com:apache/incubator-aurora