patched config loader to use toml.PrimitiveDecodeStrict when loading
plugins
fixed some old TOML files that still referenced message_filter
removed the outputs param from TOML tests
added tests for common parameters that aren't part of a struct
Merge branch 'dev' into features/issue_124

Conflicts:
	pipeline/config_test.go
Improve random string generation, use it for payload in both static and dynamic size
message generation, add support for 'ascii_only' config to restrict random strings
to ascii characters.
use reflection to extract the fields from PluginGlobals struct
Add an alerting sandbox sample

- anomaly detection using the circular buffer
  - Nagios alert generation
  - dygraph annotation for the alert event
- add a log scale toggle to make it easier view a wide range of
metrics with varying scales.
Document `ascii_only` config option.
Merge pull request #267 from mozilla-services/features/flood-ascii-only

flood improvements
Merge pull request #266 from mozilla-services/features/issue_124

Features/issue 124
Merge pull request #270 from mozilla-services/example/alerting

Add an alerting sandbox sample
Add heka.js to the DashboardOutput
Merge pull request #274 from mozilla-services/issue_273

Add heka.js to the DashboardOutput
Some lines have a node_s value of "-".
Merge branch 'dev' of github.com:mozilla-services/heka into dev