Updated README for new grunt.file.read convention

I was trying to get private key auth going and found that grunt no longer supports grunt.file.load--it seems to have been removed in favor of grunt.file.read.
Merge pull request #9 from estoner/patch-1

Updated README for new grunt.file.read convention
add travis
add grunt-cli dep
fix for travis
valid yaml
0.8+
update ssh2 dependency
add version badge
Uploading via SFTP asyncronously seems to cause problems with large files.
Fixing race conditions where the ssh connection is closed before all files have been transfered using sftp.
Merge pull request #12 from johngeorgewright/race-conditions

Race conditions
tidy
update release history; bump version
add travis image