Added Travis CI integration

[Srokap]

Fixes #342

• Enable builds at https://travis-ci.org/trentm/node-bunyan

For sample builds, see https://travis-ci.org/Srokap/node-bunyan/builds

There seems to be some random failures on osx that go away on reruns, they look like that:

> make test
test -z "1" || test -n "" || \
        (node -e 'require("dtrace-provider").createDTraceProvider("isthisthingon")' && \
        echo "\nNote: Use 'SKIP_DTRACE=1 make test' to skip parts of the test suite that require root." && \
        sudo ./node_modules/.bin/nodeunit test/dtrace.test.js)
Note: Use 'SKIP_DTRACE=1 make test' to skip parts of the test suite that require root.
dtrace.test.js
✔ basic dtrace
✖ bunyan -p
AssertionError: 20 == 10
    at Object.equal (/Users/travis/build/Srokap/node-bunyan/node_modules/nodeunit/lib/types.js:83:39)
    at ChildProcess.<anonymous> (/Users/travis/build/Srokap/node-bunyan/test/dtrace.test.js:108:15)
    at ChildProcess.emit (events.js:110:17)
    at Process.ChildProcess._handle.onexit (child_process.js:1078:12)
AssertionError: 'hi at debug' == 'hi at trace'
    at Object.equal (/Users/travis/build/Srokap/node-bunyan/node_modules/nodeunit/lib/types.js:83:39)
    at ChildProcess.<anonymous> (/Users/travis/build/Srokap/node-bunyan/test/dtrace.test.js:109:15)
    at ChildProcess.emit (events.js:110:17)
    at Process.ChildProcess._handle.onexit (child_process.js:1078:12)
FAILURES: 2/11 assertions failed (4468ms)
make: *** [test] Error 1
npm ERR! Test failed.  See above for more details.
The command "npm test" exited with 1.
Done. Your build exited with 1.

[twhiteman]

Looks good, I think this would be useful, though needs a couple of tweaks.

[twhiteman]

This would be good, though a couple of suggestions:

• remove 'iojs'
• add node 6 and 7
• add SKIP_DTRACE=1 environment variable

[Srokap]

Updated. Needed t rebase on current master branch for it to stop failing on node 7. I left node entry instead of 7 as those are pointing to same version. If node 8 branches off as stable, we'll need to update the list. Passes all versions on Linux, currently OSX builds are pending, need to make sure https://travis-ci.org/Srokap/node-bunyan/builds/206856505 passed before merging just to be safe.

[Srokap]

@twhiteman PTAL

[twhiteman]

All looks good to me, @trentm please merge and add GitHub Travis CI hook, or hook me up and I'll do it :)

[trentm]

Yah, I think that is working: https://travis-ci.org/trentm/node-bunyan/builds/207566856

@Srokap Thanks very much!