added tests for callbacks and buffering
changed test to test callbacks in order
more extensive tests for executing callbacks in order
changed test to listen to `flushComplete`
changed flushComplete to flush
added test for client-side buffer cleanup
remove  from tests
package: for travis
Merge pull request #157 from albertyfwu/bug136_tests

added tests for callbacks and buffering
Merge branch 'master' of github.com:/LearnBoost/engine.io
Fix typos and use consistent capitalization
Merge pull request #162 from mscdex/patch-1

Fix typos and use consistent capitalization
Merge remote branch 'upstream/master' into bug-159-fix