small debug fix in file util
improved json-pointer definition
fixed Tracker to properly toggle state
added .tsdrc & proxy support

.tsdrc user-level config
- JSON encoded file in $HOME or CWD
- supports options from ./conf/settings.json

added proxy support
- proxy property in .tsdrc
- process.env.HTTPS_PROXY / https_proxy / HTTP_PROXY / http_proxy
- implemented in http-cache / loader

expanded xm.JSONPointer to stack source objects
- added few basic tests

renamed a test in json-stabilizer.ts
added proxy + tsdrc info to README.md
fixed git test
fixed reference bundle path bug

modified to generate correct relative paths
allow the bundle .d.ts file to be anywhere relative to the typings folder
use with the 'bundle' field in tsd.json:
- typings: './typings'
- bundle: './any/where/<n>.d.ts' (instead of just './typings/<n>.d.ts')
BundleManager.ts works with absolute reference paths, converted on usage
added some Bundle tests
moving to 0.5.7