Fixed behaviour of 'handle_postinstall', where empty commands where being executed due to interference between the pre postinstall script code and the standard postinstall code.
Support cygwin style file path for VBoxManage arguments

In cygwin world, file path style is like UNIX style. ("c:\foo\bar" -> "/cygdrive/c/foo/bar")
But normal windows executable cannot recognize this style, so before execute VBoxManage, convert from cygwin style path to windows style are needed.

- check RbConfig::CONFIG['host_os'] for cygwin world or not
- if in cygwin world, before execute VBoxManager, convert file path by cygpath tool
fix typo in provider.rb
Merge pull request #640 from juliandunn/patch-1

fix typo in provider.rb
Merge remote-tracking branch 'upstream/master'
Added the Solaris10 template, base on the u11 GA x86 DVD iso.
Merge pull request #645 from tnarik/solaris10

Solaris10
Overhaul all documentation
Merge pull request #644 from benlinton/master

Overhaul all documentation
Fixed typo
Merge pull request #647 from briankiewel/master

Fixed typo in basics readme
Merge branch 'cygpath-support'