tomd: modify test of gauge values to send a very large number, proving that long values are transmitted faithfully.  This will ensure that a fix to issue #19 does not break long gauge values
add travis yaml file for issue #24
add travis build indicator to README -- fixes #24
update README for latest revision
Merge remote-tracking branch 'upstream/master' into double-gauge
More Tests for Gauges

* Test that a gauge of 0 sends a zero and not a zero delta
* Test that double values of high precision are sent properly
Use common method to handle logic of sending gauges