Run full test suite in Travis

Summary: With old travis infrastructure, we couldn't run the whole test suite without crashing. Now we transfered to the new architecture and are able to run full `make check` instead of just db_test.

Test Plan:
https://travis-ci.org/facebook/rocksdb/builds/79591564

This test has failed, true, but it's actual problem with tests:
* t8316104 -- Failed ColumnFamilyTest.ReadDroppedColumnFamily and also https://github.com/facebook/rocksdb/issues/673
* Too many open files:

    db/db_universal_compaction_test.cc:514: Failure
    Put(1, Key(i % num_keys), Key(i))
    IO error: /tmp/rocksdbtest-501/db_universal_compaction_prallel_test/000331.sst: Too many open files

Reviewers: sdong, anthony, kradhakrishnan, IslamAbdelRahman

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D46545

.travis.yml

@@ -15,13 +15,14 @@ matrix:
 
 before_script:
     - if [ -n "${COMPILER}" ]; then CXX=${COMPILER}; fi
-    - if [[ $(uname -s) == 'Darwin' ]]; then brew install snappy; fi
+    - if [[ $(uname -s) == 'Darwin' ]]; then brew install gflags snappy; fi
 
 # Lousy hack to disable use and testing of fallocate, which doesn't behave quite
 # as EnvPosixTest::AllocateTest expects within the Travis OpenVZ environment.
-script: OPT=-DTRAVIS V=1 make db_test && ./db_test && OPT=-DTRAVIS V=1 make clean jclean rocksdbjava jtest
+script: OPT=-DTRAVIS V=1 make -j4 check && OPT=-DTRAVIS V=1 make clean jclean rocksdbjava jtest
 
 notifications:
-    email: false
+    email:
+      - leveldb@fb.com
     webhooks:
       - https://buildtimetrend.herokuapp.com/travis