First cut of wavefront storage driver - quotes tag values

- Added convert_groups config parameter
- Cleaned up error messages
- Removed all references to OpenTSDB format

- Updated configuration names and default values
- Updated special character handling and added new regex option
- Added new “hidden” DebugAll option to print original metric and field
names

- Change tag host to be source per Wavefront data format
- Added SimpleFields property which when true will use “value” as field
name when specified (default false)
- Cleanup of sample config

Full support for Wavefront data format

# Conflicts:
#	Makefile
#	plugins/outputs/wavefront/wavefront.go
#	plugins/outputs/wavefront/wavefront_test.go

# Conflicts:
#	Makefile
#	plugins/outputs/wavefront/wavefront.go
#	plugins/outputs/wavefront/wavefront_test.go

- Use new logging form or D! or E!
- added tagValueReplacer just for tag values, instead of using
santizedChars
- re-added forward slash (/) to sanitizedChars

- Changed order of variables to match sample config and readme

- point tag names with quotes `”` will now be escaped `\”`

- removed redundant (and commented) statsd section

Wavefront output

Changed name of Wavefront source option to source_override