fix(gemspec): remove implicit and useless active-support dependency.
Merge pull request #1 from jperville/gemspec-dependency-fix

fix(gemspec): remove implicit and useless active-support dependency.
Add Rakefile

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Rewriting specs

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Fix Railtie Initialization

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Rebased branch 'fix_railties' of github.com:PerfectMemory/smtp_url into fix_railties