Fix the find shell helper for commands without newline

Also fixed when the help of the command contains newlines
fix for getEnv() error.
Merge pull request #45 from kiy0taka/master

getEnv() does not work in OSX 10.8.2
fix for show dbs formatting
put back tab in show dbs
make show dbs like SERVER-6885
fixes #44 and makes sh.status() really nice
sh.status now uses aggregation framework
nicer formatting for shard tags
Update README.md
new aggreagation framework api helper
initial modular refactoring
fixes #46 TypeError on no data returned from query
remove checked in mongo_hacker.js
avoid telling user that there are no more documents
ocd
colorize show dbs
fix BinData#tojson with subtype 3
add python UUID type to avoid confusion
fix indentation