propelorm/Propel — pull request #407 by grray (2012-07-10 07:19:32+00:00)
Title: Fix for using platform class configured in build properties

In documentation stated, that i can specify my own platform class like this
```
# Platform classes
propel.platform.class = platform.${propel.database}Platform
```
This change fixes getConfiguredPlatform function to use platform from build properties, if specified