Added control flow to bfmSpatial.

First, if a value for sensor is given, names(x) must correspond to Landsat sceneID's, otherwise this will be ignored with a warning message.

Second, if all values in a pixel stack are NA, it doesnt make sense to run bfastmonitor (and previously, this would return an error, and therefore a value of 1 to the error layer). Now, all output pixel values are NA if the original values for a pixel stack were all NA's (ie. if a mask had been previously applied).
Merge branch 'feature-bfmSpatial' into develop
merge previous commit

Merge branch 'develop' of http://github.com/dutri001/bfastSpatial into develop

Conflicts:
	R/bfmSpatial.R
resolve conflicts
solved conflict in bfmSpatial
Corrected a few things in the examples of processLandsat and processLandsatBatch
Checked documentation for all of the functions I (co)wrote. Added some examples.
Merge branch 'fix-documentation' into develop
ReOxygenized package
Merge branch 'develop' of https://github.com/dutri001/bfastSpatial into develop
Documentation up to date.
Fix roclets

It seems that itemize tags were not allowed. I had also reversed link and code a number of times, causing a Latex error when linking to other functions.
Merge branch 'fix-Rd' into develop
roxygenised!
Fixed roclets.

I had forgotten 2 functions in the previous fix.
roxygenised
Remove () in links

...because it doesnt work that way.
switched to version number 0.2
Merge branch 'develop'
Merge branch 'master' into vignette