add commands for solaris 10
fix check_link command for Solaris10.

- '-w' option of grep is not allowed.
- modify to check strictly
Merge branch 'add-commands-for-solaris10' of https://github.com/ftnk/serverspec into pat_solaris10
added pkginfo command for check_installed
added numerous override methods for solaris 10
added check_file_md5checksum for solaris 11
override check_authorized_key for solaris 10 using alternate grep
use standard grep without -w option for solaris 10 check_authorized_key
added file, group, package and user specs for solaris10
use perl instead of ls everywhere, adjust tests accordingly
Merge branch 'master' into pat_solaris10
removed solaris11 method check_file
Introduce property instead of attr

In some situation, attr method calls Module#attr, not Serverspec::Helper::Attributes.
Show deprecated warning when using attr and attr_set
Replace attr to property used in serverspec/helper/detect_os.rb
Remove spec/helper/attributes_spec.rb because it's not needed anymore
Merge pull request #293 from serverspec/introduce-property-instead-of-attr

Introduce property instead of attr
Bump up version
Don't set HostName gotten by vagrant ssh-config to c.host

Because HostName is 127.0.0.1 and it differ from hostname, so SSH connection open/close for each test.
It slows down test processes.
Merge pull request #294 from serverspec/fix-for-vagrant

Don't set HostName gotten by vagrant ssh-config to c.host