Added call to show the prompt (the rating alert) explicitly.

In some cases you may want to show the prompt for rating explicitly regardless Appirater settings.
Explicite prompt won't be showed, if user has declined to rate the app.
Merge pull request #106 from amjaliks/features/showprompt

Added call to show the prompt (the rating alert) explicitly
Made _delegate class variable __weak.
use CFBundleDisplayName instead of CFBundleName
Merge pull request #113 from rsanchezsaez/master

Delegate variable is strong
Add __weak for delegate on iOS 5+ only

In order to allow compilation for applications targeting iOS 4.3 without losing __weak benefits for further iOS versions, you should apply conditional compilation.
Minor translation fix (Norwegian)

Removed " du", sounded strange
Merge pull request #117 from cturnbull/master

Norwegian translation fix
Updated podspec
Updated podspec deployment target
Merge pull request #114 from toco/master

use CFBundleDisplayName instead of CFBundleName
Merge pull request #116 from xhaleera/patch-1

Add __weak for delegate on iOS 5+ only