add command line shortcut to view changelog

I keep forgetting where this file lives (and like to refer to it pretty often), so I figured it might be a nice thing to expose in the motion command.
Support app_store_category config var for OSX apps.

Allows you to set app_store category configuration value instead of doing this:

app.info_plist['LSApplicationCategoryType'] = 'public.app-category.developer-tools'

This allows you to specify:

app.app_store_category = 'developer-tools'
 - or -
app.app_store_category = 'public.app-category.developer-tools'
Update to add new status bar style

Added UIStatusBarStyleLightContent as an option for status_bar_style, a new option added in iOS7.
Merge pull request #116 from chrisradford/master

Add new status bar style
Rename @app_store_category to just @category
Added a default value for LSApplicationCategoryType (utilities). Extracted hash to its own method.
Updated code based on Laurent's suggestion.
Fix typo - LSApplicationCategoryType
fix escaping + print message if there are no crash logs
refactor crash message + fix wording
fix a bug in `rake spec' which always return exit(0) status
fix a mistake in 7fffe1ae44c436ceef2289b12528e8b8266a2728
use system pager to display changelog messages
update copy for post-update for motion changelog command
Merge pull request #107 from dlo/master

Add command line shortcut to view changelog
Merge pull request #115 from markrickert/add-app-store-category

Support app_store_category config var for OSX apps.
app.short_version defaults to app.version
add builtin command for lldb
add support for multiple rubymotion versions on one machine
fix error in wanted_software_version check