Add update level

New Options: (old .plist file works fine with this new version i tested it)

3 new level options:
- low (same as before all 3 buttons apear, this is the default level if no level is set),
- medium (only download and remind me later (if lenght > 0) apear),
- high (only download apear in case of catastrophic need of update, problems happen right?)

how to setup new settings:

[iVersion sharedInstance].updateLevel = 2; (1 for low, 2 for medium, 3 for high)

or in remote plist (old plist files structure still works):

This plist file will behave differently for different versions of the application:

- If user have installed version 1.0, the app will only have the download button for the user to press.

-if user have version 1.1 installed, the app will have all 3 buttons.

-if user have version 1.2 installed, the app will have Download and Remind me Later buttons.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>1.0</key>
	<dict>
		<key>details</key>
		<array>
			<string>First release</string>
		</array>
		<key>level</key>
		<integer>1</integer>
	</dict>
	<key>1.1</key>
	<dict>
		<key>details</key>
		<array>
			<string>NEW: Added  new snoodlebar feature</string>
			<string>FIX: Fixed the bugalloo glitch that makes the app crash a lot!!</string>
		</array>
		<key>level</key>
		<integer>3</integer>
	</dict>
	<key>1.2</key>
	<array>
		<string>NEW: Some important feature</string>
		<string>CHANGE: Some significant change</string>
	</array>
        <key>1.3</key>
	<dict>
		<key>details</key>
		<array>
			<string>NEW: Something cool</string>
			<string>FIX: Really important bug but app still works</string>
		</array>
		<key>level</key>
		<integer>2</integer>
	</dict>
</dict>
</plist>


Any questions feel free to ask, i can re-rewrite the readme file to incorporate this changes if you need it.