Add some more helpful information to the assertion failure in Clicker.clickOnScreen(float,float).

Include the computed (x, y) coordinates of the faile click, plus the name and message of any SecurityException encountered.
when the Sender cannot complete an action, add information about any possible exception that was responsible.
Merge remote-tracking branch 'jayway/robotium/master'
cc: brian
Conflicts:
	robotium-solo/src/main/java/com/jayway/android/robotium/solo/Clicker.java
add some convienence methods to Solo
Merge branch 'master' of git://github.com/locationlabs/robotium into HEAD

Conflicts:
	robotium-solo/src/main/java/com/jayway/android/robotium/solo/Solo.java
Merge branch 'master' of https://github.com/locationlabs/robotium
Merge commit '827ba69e67f6f8c98cec2f166ea1c60acd63f15e'
compilation fix for the Clicker class
add some imports to Solo to get things compiling
Merge pull request #64 from locationlabs/master

Some convenience methods and extra error information
Replacing Solo.java with previous one