Updated runreef.psm1

 * When on a machine with no YARN install ('$HADOOP_HOME' isn't set), it will work, assuming that the main class loaded does.
 * When the path to $JAVA_HOME contains spaces (e.g. 'C:\Program Files\java\...'), it will now work.
Code cleanup pass over c.m.r.c
 * Removed `ClientConfigurationOptions` and moved the named parameters therein to the package `com.microsoft.reef.client.parameters`
 * Removed `DriverConfigurationOptions`  and moved the named parameters therein to the package `com.microsoft.reef.driver.parameters`
 * JavaDoc updates
Merge pull request #772 from Microsoft-CISL/weimer_runreef

Updated runreef.psm1
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