Initial implementation

Receives readings as xml via POST /metrics
Returns readings as JSON via GET /metrics

All results are stored in memory and are lost when the process
terminates.
Add Godeps for dependency vendoring
Add Procfile for heroku
Import generated Godeps
Add Travis
Remove else that confuses go1
Specify hex as format for HexInt parsing
Revert "Specify hex as format for HexInt parsing"

This reverts commit ba34cca042e27b46df61ed651f2e805a18d11629.
Disable testing on go < 1.2
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Reorganize package

Rename executable in Procfile to Heroku still works.