Fixes #29
Merge pull request #32 from staticfloat/master

Don't set PKG_CONFIG_LIBDIR
Fix delete! usage so that BinDeps works on all v0.2-pre versions of julia
Merge pull request #33 from kmsquire/fix_delete

Fix delete! usage so that BinDeps works on all v0.2-pre versions of julia
Some function for easier debugging
Merge pull request #31 from mlubin/master

Fixes #29
Make :runtime actually functional
Misc. additions

Most notably the addition of the `build` function to build a selected
package with a selected provider. E.g.
```julia
BinDeps.build("Tk",BinDeps.BuildProcess)
```

The other changes are mostly for Win64 support (7z files and support for
libraries in the bin/ rather than the lib/ directory)
Fix error thrown by test_success if curl/wget/fetch command not found
Merge pull request #38 from ihnorton/fix_ENOENT_err

Fix error thrown by test_success if curl/wget/fetch command not found
Bugfix for glib-mkenums error
Bugfixes for compiling Cairo from source