Enable the net_http probe by default
Update to rust master

* Do not double copy when serializing
* Remove old Rust types
* Remove annotation header functions
* Add new unit tests around Numbers, Strings and Structs
Use uint32_t instead of int
Inline rust_support macro and prototype
Safely fail if library/headers are not found

Fixes #154
Depend on rspec < 3
Use new rust library
Release 0.3.14
Better error messages when config/skylight.yml is invalid
Only freeze string values

Without this check we ended up doing things like freezing `nil`.This shouldn't
usually be a problem but old versions of rack-mini-profiler were assigning
instance variables to `nil`. As there is only one `nil` object used globally
and we had frozen it, this caused rack-mini-profiler to blow up.
Lock version of bson to maintain Ruby 1.9.2 support
Moved some gems to the development group
Add bson definition to Gemfile.base instead
Better error messages for non-writeable lock/sockfile path
Merge pull request #196 from tildeio/better-sockfile-error

Better error messages for non-writeable lock/sockfile path
Organize normalizers
More normalizer reorganization
Added initial ActiveSupport::Cache support
Merge pull request #197 from tildeio/cache-support

Added initial ActiveSupport::Cache support
Monkeypatch ActiveSupport::Cache::Store.instrument to always be true