This commit refactors the pilosa codebase. It makes several major
changes:
* Removes bitmap handles
* Removes dispatch/hold/transport
* Removes etcd dependency
* Adds consistent hash ring for slice placement
* Refactors parser/lexer
* Adds strong typing to PQL AST
* Flattens package hierarchy
This commit moves dependency management to use godep and the
new experimental vendoring support in Go 1.5.
NOTE: You must set `GO15VENDOREXPERIMENT` in your bash environment
for vendoring to work properly! See the updated `README` for details.
This commit updates the import path from:
```
pilosa/*
```
to:
```
github.com/umbel/pilosa/*
```
This follows standard Go convention and makes the project "go gettable".
The README was also updated to reflect the changes.
