v60

Make the $GOPATH check from v59 a warning.

v59: Enforce requirement to be inside of a go src directory.

A lot of time is usually spent tracking down bug reports where users are
using godep outside of their $GOPATH. This should help with that, at least
until there it time to properly test godep use outside of a $GOPATH and
fix the issues.

v58: Add GodepVersion to Godeps.json

This is so that as godep changes / adds features / fixes bugs we can
determine which version of godep last wrote out the file.

v57

Merge branch 'no_git_show_toplevel'

v56: Consolidate path equality checks into pathEqual

Instead of repeating the problem every time, fold this stuff into a
function we can use.

Fix for case insensitive filesystems

Replace simple == with strings.EqualFold

In listFiles I added a check to ensure that godep only processes files
in the current directory. This check was unfortunately a byte by byte
check, not a case insensitive check. With case insensitive filesystems
"Code" == "code".

So replace that with a strings.EqualFold()

v54

Bump version/docs

v53: Disable VendorExperiment if we have a workspace

Several people have asked for this and it's what most people will
probably expect.

Fixes #411

v52

Trim 'rc' out of go version strings when determining major version.

v51: Trim 'beta' out of go version strings

This is currently broken, so go1.6beta2 will produce `go1.6beta1`
instead of `go1.6`.

Fixes #402