Add cuckoo table options to the C interface
Add very basic tests to make sure the C cuckoo table options compile and run
Update docs for NewAdaptiveTableFactory
Merge pull request #394 from lalinsky/cuckoo-c

Cuckoo table options missing in the C interface
Fix compaction_job_test
Explicitly clean JobContext

Summary: This way we can gurantee that old MemTables get destructed before DBImpl gets destructed, which might be useful if we want to make them depend on state from DBImpl.

Test Plan: make check with asserts in JobContext's destructor

Reviewers: ljin, sdong, yhchiang, rven, jonahcohen

Reviewed By: jonahcohen

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D28959
Clean job context in DeleteFile
Don't parallelize the build in travis
Fix signed/unsigned compile
Clean job_context