Add Custom ember app name option to boostrap

Allow user to specify the app name Usage:
  rails new APP_PATH [options]

Options:
  -r, [--ruby=PATH]              # Path to the Ruby binary of your choice
                                 # Default: /usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby
  -b, [--builder=BUILDER]        # Path to a application builder (can be a filesystem path or URL)
  -m, [--template=TEMPLATE]      # Path to an application template (can be a filesystem path or URL)
      [--skip-gemfile]           # Don't create a Gemfile
      [--skip-bundle]            # Don't run bundle install
  -G, [--skip-git]               # Skip Git ignores and keeps
  -O, [--skip-active-record]     # Skip Active Record files
  -S, [--skip-sprockets]         # Skip Sprockets files
  -d, [--database=DATABASE]      # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db/sqlserver/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc)
                                 # Default: sqlite3
  -j, [--javascript=JAVASCRIPT]  # Preconfigure for selected JavaScript library
                                 # Default: jquery
  -J, [--skip-javascript]        # Skip JavaScript files
      [--dev]                    # Setup the application with Gemfile pointing to your Rails checkout
      [--edge]                   # Setup the application with Gemfile pointing to Rails repository
  -T, [--skip-test-unit]         # Skip Test::Unit files
      [--old-style-hash]         # Force using old style hash (:foo => 'bar') on Ruby >= 1.9

Runtime options:
  -f, [--force]    # Overwrite files that already exist
  -p, [--pretend]  # Run but do not make any changes
  -q, [--quiet]    # Suppress status output
  -s, [--skip]     # Skip files that already exist

Rails options:
  -h, [--help]     # Show this help message and quit
  -v, [--version]  # Show Rails version number and quit

Description:
    The 'rails new' command creates a new Rails application with a default
    directory structure and configuration at the path you specify.

    You can specify extra command-line arguments to be used every time
    'rails new' runs in the .railsrc configuration file in your home directory.

    Note that the arguments specified in the .railsrc file don't affect the
    defaults values shown above in this help message.

Example:
    rails new ~/Code/Ruby/weblog

    This generates a skeletal Rails installation in ~/Code/Ruby/weblog.
    See the README in the newly created application to get going. Would use  as
Ember app namespace rather than the rails app name
add custom ember app name to generators

Allows for passing -n APPNAME to use something other than the default ::Rails.application.class
Merge pull request #200 from knomedia/add-bootstrap-appname

Allow for custom ember app name in generators
Update Readme to include ember.1.0.0rc5 dep
remove warning for RAILS_ENV == test; use dev variant for test env.

fixes #184
Merge pull request #202 from fivetanley/default-to-dev-variant-in-test-environment

remove warning for RAILS_ENV == test; use dev variant for test env.
Remove unnecessary `bundle exec` in README.md

`bundle exec` is not required to run rails commands.
Merge pull request #203 from nragaz/patch-1

Remove unnecessary `bundle exec` in README.md
Add appraisal for rail4.0.0.rc1 and ember rc5
Namespace accessing Rails.env

Fixes bug introduced in 8600986e635c1b102b66700e0b211ed7a4400d38
Merge pull request #204 from kurtisnelson/master

Fix bug introduced in 8600986e635c1b102b66700e0b211ed7a4400d38
Remove unnecessary `Ember::Handlebars::VERSION`

It couldn't specify from ember-rails because it depends on handlebars-source.
Merge pull request #205 from tricknotes/remove-handlebars-version

Remove unnecessary `Ember::Handlebars::VERSION`
bump gem version
Update README.md