add Complete command

[back2mach]

autocomplete support using racer

Installation

1. Install racer https://github.com/phildawes/racer
2. clone rust source https://github.com/rust-lang
3. configure env variable
4. Option + ESC to trigger autocomplete

[infininight]

Can't get around having to set the RUST_SRC_PATH variable but if you provide a locations array with the likely path of racer in requiredCommands you can likely skip the need to set TM_RACER for most everyone. (/usr/local/binand perhaps /opt/local/binif it's installable from MacPorts.)

require_cmd.rb is deprecated, requiredCommands is built into TextMate now.

[back2mach]

@infininight Nice idea, a default path will be fine for most of people.

[carols10cents]

This is awesome, thank you so much!!!!!!! 🎉 🎈

As @infininight recommended, I removed the deprecated require_cmd.rb and set some default locations (including where cargo install is likely to put binaries by default; racer seems like an ideal candidate to start recommending the use of cargo install soon).

Also added the instructions you provided to the readme (thank you thank you thank you!) and merged it all in!!!!