Experimental code to use haproxy as a transparent proxy.
Add exception handling for checks.d initialization. Fixes #427
Improve checks.d traceback passing for info command
Update agent check command to handle new config.load_check_directory signature
Fix process check. Adapt its behavior according to the version of psutil.
Remove need for checks.d CheckStatus.init_failed field
Rename checks.d CheckStatus.init_failed_exception to init_failed_error
for more consistent naming within checks
Disable memory consumption watcher by default
Fix #501
Support to set any redid parameter in the yaml file. 
Fix #276
Update Apache example config tag to be of correct type
Source install: Don't send output of sed of launchd script to install log.

This was causing the output of the file to go to the install log and not to the plist file.
Fix to the process check
Merge pull request #500 from DataDog/427b-handle-check.d-exceptions

427b handle check.d exceptions
Merge branch 'master' of github.com:DataDog/dd-agent
Fix conflict
Bump to 3.7.1
Use /usr/bin/env python instead of hardcoding the path.
Merge pull request #511 from DataDog/haproxy-proxy

HAProxy can be used as a high-performance proxy instead of the forwarder
Use old-style string formatter to ensure 2.4 compatibility