Add version command to CLI

`suspenders --version` in the CLI, Suspenders responds with the message
"No value provided for required arguments 'app_path'".

This changeset adds `-v` and `--version` options to `bin/suspenders.rb`.
Those commands will now return the proper suspenders version in the CLI.

[closes #638]

NEWS.md

@@ -1,3 +1,7 @@
+1.34.0 (unreleased)
+
+* Suspenders command line responds to `-v` and `--version` options
+
 1.33.0 (October 23, 2015)
 
 * Add `quiet_assets` as development dependency

bin/suspenders

@@ -6,6 +6,11 @@ $LOAD_PATH << source_path
 
 require 'suspenders'
 
+if ['-v', '--version'].include? ARGV[0]
+  puts Suspenders::VERSION
+  exit 0
+end
+
 templates_root = File.expand_path(File.join("..", "templates"), File.dirname(__FILE__))
 Suspenders::AppGenerator.source_root templates_root
 Suspenders::AppGenerator.source_paths << Rails::Generators::AppGenerator.source_root << templates_root