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.
Bugfix for issue-506
Javadoc update in WebElement
Added null check in assertCurrentActivity
Added null check in getNumberOfMatches
Always return the total amount of matches in getNumberOfMatches
Minor javadoc update
[maven-release-plugin] prepare release robotium-4.3
[maven-release-plugin] prepare for next development iteration
Merge remote-tracking branch 'jayway/robotium/master'
cc: brian
Conflicts:
	robotium-solo/src/main/java/com/jayway/android/robotium/solo/Clicker.java
minor update javadoc.

Solo#drag(float, float, float, int)
- @param fromY *X* cordinate...
+ @param fromY *Y* cordinate...
Merge pull request #60 from hidekuro/patch-1

minor update javadoc.
fix method name typo

waitForWebElementsToBe **Creted** -> waitForWebElementsToBe **Created**
Merge pull request #61 from hidekuro/patch-1

fix method name typo
Bugfix in getView()
Minor modification in waitForDialogToOpen()
Bugfix for issue-527
Bugfix for issue-538
Catch exception in clickOnActionBarHomeButton()