Allows position RangedData argument to have multiple spaces.
Introduces argument checking.
Adds `na.rm = TRUE` to peptide summarization methods, in case of removed
spots. 
Uses the match function to match peptides in peptideSet with rownames of
RangedData position object.
Merge branch 'master' of ssh://git@github.com/RGLab/pepStat.git
Imports cbind method from IRanges package
Allow sliding mean to apply over separate spaces in RangedData slot
Add warning message about smoothing over multiple spaces, fix typo bug.
Expanded explanations of arguments and function requirements.
Add a details section to explain argument requirements.
Change log-check "stop" to a warning, fix a change in first stop
Improve Zpep track for normalization. 
Adds a function to compute Z-scales from peptide sequences if Z-scale
values are not found in the featureRange slot of the peptideSet
argument.

Removes some redundant or unnecessary pieces of code and comments. 

Adds a check to the method argument.
Fix bug in how normalization data is added to "preproc" info.
Merge branch 'devel' into devel-new

Conflicts:
	NAMESPACE
	R/NormalizeArray.R
	R/slidingMean.R
	R/summarizePeptides.R