Modify SpecInfra::Backend::Exec#build_command

Now we transform the given shell command into `/bin/sh -c #{cmd}`,
so that we don't need to parse shell syntax.
Update spec for SpecInfra::Backend::Exec#build_command
 Merge pull request #39 from hanazuki:build-command

Fix build_command

Merge remote-tracking branch 'pr/39/head' into 2.0

Conflicts:
	spec/backend/exec/build_command_spec.rb
Bump up version
SpecInfra is renamed to Specinfra
Merge pull request #104 from serverspec/lowercase

Rename SpecInfra to Specinfra
Bump up version
Merge branch 'master' into 2.0

Conflicts:
	lib/specinfra/backend/exec.rb
	lib/specinfra/version.rb
Merge branch 'master' into 2.0

Conflicts:
	lib/specinfra/helper/detect_os.rb
	lib/specinfra/version.rb
Merge branch 'master' into 2.0
Change SpecInfra to Specinfra after merging master
Change SpecInfra to Specinfa after merging master
Add Specinfra::Runner to avoid calling backend directory outside Specinfra
Bump up version
Add openSUSE support
convert ppa:username/reponame to apt_line_uri
Add check_process_count feature

This check allows to validate if number of processes are running that are being expected
Test
Revert "Test"

This reverts commit 83d7637e3e2046f6042506a9f2fb87f37d6b5ffc.
Add set helper method