Add support for 'real' keys & values

[apizz]

In both of the manifests I've been working on - AirServer & DetectX Swift - both use real number keys (<real></real>) in some capacity.

However, it appears that when real numbers are used as part of a preference in a manifest, the preference doesn't appear at all. Here is an example:

                  <dict>
			<key>pfm_name</key>
			<string>SUScheduledCheckInterval</string>
			<key>pfm_type</key>
			<string>real</string>
			<key>pfm_description</key>
			<string>Frequency to complete automatic software update checks.</string>
			<key>pfm_range_list</key>
			<array>
				<real>3600</real>
				<real>86400</real>
				<real>604800</real>
				<real>2629800</real>
			</array>
			<key>pfm_range_list_titles</key>
			<array>
				<string>Hourly</string>
				<string>Daily</string>
				<string>Weekly</string>
				<string>Monthly</string>
			</array>
		</dict>

[erikberglund]

That is currently only set when using float, but good idea, is should add real as an alias too.

[erikberglund]

I've added this to the next update. You can then use both real or float for the floating point numbers.