Remove the 60 plugin since Heka now supports configuration options

Add a SanboxManager to allow plugin modifications without restarting Heka
Kill Heka via SIGINT instead of SIGTERM

In order to preserve the previous buffers, Heka should be killed with SIGINT.
SIGTERM causes it to shut down immediately without writing out the backup.
Handle (skip) empty records.
Move the traceback, only print interesting ones.
Move the traceback once more.
Add the production "process incoming" config.
Set the 'nofile' ulimit for upstart scripts.
Add a new config for use by Spot Instances.

Use a smaller log file and shorter timeout to minimize data loss in case of
unfriendly shutdown.
Decrease the sleep duration when exporting.
Add a logrotate config for telemetry-incoming
Ignore .out files
Fix broken links and <..> formatting
Fix links
Merge pull request #10 from irvingreid/master

Fix broken links in documentation
Prepare for upstream aggregation
Merge pull request #11 from mreid-moz/heka_updates

Heka updates
Simplify and speed up the input selection logic.
Fixed a mismatched brace
Reorder arguments
Update plugins

- add cbuf deltas to telemetry.lua
- fix preservation of all in telemetry_channel.lua