Function to check if character conforms to Landsat naming convention
Created .hasLandsatSceneID()

Function returns TRUE if all elements of input conform to Landsat sceneID, and FALSE otherwise. Works on raster objects and character vectors.
Simplified the isLandsatSceneID function and extended it to the classes rasterBrick / rasterStack
Renaming of the file went wrong in the previous commit
merge with remote branch

Merge branch 'feature-isLandsatSceneID' of http://github.com/dutri001/bfastSpatial into feature-isLandsatSceneID

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Forgot to include all() in first condition
Edited functions to include .isLandsatSceneID as a check
Merge branch 'feature-isLandsatSceneID' into develop

Merge into develop