packer: Provide line number for invalid json syntax [GH-56]

[GH-91]

/cc @smerrill

Log Packer OS/Arch to Debug

Log Packer Version to Debug

Fixes #85

Note that Mercurial (hg) is a dependency for developing on Packer

website: FIx a typo

builders/vmware: Upload vmware tools (only Linux for now)

Fix building on Ubuntu

1) /bin/sh is not /bin/bash, so build.sh needs to explictly use /bin/bash
2) dash's echo does not support \x, but it does support \0 (since dash is
   /bin/sh, it gets used by Makefiles).

.gitignore the /src directory

website: Grammar tweak for veewee-to-packer docs