Merge pull request #25 from zehome/master

Allow unicode inside templates and/or data tags
remove yield_metrics (was for old inspect)
make sure wtt tag has the proper values
add missing tags
deprecate the concept of multiple targets per metric.

* every available metric should represent one existing metric,
  and the metric should contain the appropriate information so that
  the code can "know" if there are more options (gauge -> rate, etc)
  without having to specify those explicitly on a per target level
* where we used the multi-target option to create different views
  and angles (moving averages etc), that's now deprecated.  it
  seems more appropriate that you specify "avg over x min" etc
  at runtime in your query (or even interactively with a slider),
  and/or choose a sane default based on the variability of the
  metric, and maybe, just maybe (probably not) rule definitions
  in your preferences that make GE apply certain mutations based
  on metric tags/metric_id
use mysql as storage of structured metrics

 * for compatibility with carbon_tagger, so that GE can use
   both metrics from carbon_tagger as well as structure_metrics
 * [so that you can speed up creation of structured_metrics, i.e.
   you can have multiple processes in parrallel working on a
   different slice of the partition space]
 * comes with a bunch of different implementations of querying,
   all of which are far from ideal, however. :(
use 'unit' tags in favor of old 'what' tags
rawes/requests submodules to support elasticsearch
query targets in elasticsearch. seems much better then mysql
add "timestamp" target_type
add todo
remove all mysql stuff. elasticsearch is clearly superior
start using github releases mechanism
Fix sum by targets.
Use plugin configured "target" instead of raw graphite metric in sum by graphs
Merge branch 'sumbyfix'

Conflicts:
	app.py