Tons of new build features

* The OS/DISTRO are available as defines when writing tables:
  UBUNTU, UBUNTU_14_04, UBUNTU_12_04
  CENTOS, CENTOS_6_6
  DARWIN, DARWIN_10_10, DARWIN_10_9
* The table generation tooling now grabs virtual tables templates
  from ./osquery/tables/templates/<name>.cpp.in.
* The table generation tooling will detect reserved column names.
* suid_bin uses the new UBUNTU to restrict calls to root (fix #362).
Merge pull request #412 from theopolis/build_env

Tons of new build features