Replaced git shellout by Globby

Gemfile.lock

@@ -121,6 +121,7 @@ GEM
     formatador (0.2.5)
     globalid (0.3.7)
       activesupport (>= 4.1.0)
+    globby (0.1.2)
     guard (2.13.0)
       formatador (>= 0.2.4)
       listen (>= 2.7, <= 4.0)
@@ -382,6 +383,7 @@ DEPENDENCIES
   factory_girl_rails
   ffaker (>= 2)
   font-awesome-rails
+  globby
   guard
   guard-rails
   guard-rspec

fat_free_crm.gemspec

@@ -2,14 +2,19 @@
 $LOAD_PATH.push File.expand_path('../lib', __FILE__)
 require 'fat_free_crm/version'
 
+require 'globby'
+rules = File.read('.gitignore').split("\n")
+rules << '.git'
+files = Globby.reject(rules)
+
 Gem::Specification.new do |gem|
   gem.name = 'fat_free_crm'
   gem.authors = ['Michael Dvorkin', 'Ben Tillman', 'Nathan Broadbent', 'Stephen Kenworthy']
   gem.summary = 'Fat Free CRM'
   gem.description = 'An open source, Ruby on Rails customer relationship management platform'
   gem.homepage = 'http://fatfreecrm.com'
   gem.email = ['mike@fatfreecrm.com', 'nathan@fatfreecrm.com', 'warp@fatfreecrm.com', 'steveyken@gmail.com']
-  gem.files = `git ls-files`.split("\n")
+  gem.files = files
   gem.version = FatFreeCRM::VERSION::STRING
   gem.required_ruby_version = '>= 2.0.0'
   gem.license = 'MIT'
@@ -48,6 +53,7 @@ Gem::Specification.new do |gem|
   gem.add_dependency 'rails_autolink'
   gem.add_dependency 'coffee-script-source', '~>1.8.0' # pegged until https://github.com/jashkenas/coffeescript/issues/3829 is resolved
   gem.add_dependency 'country_select'
+  gem.add_dependency 'globby'
 
   # FatFreeCRM has released it's own versions of the following gems:
   #-----------------------------------------------------------------