MSj.jl changelog

Version `v0.3.1`

Enhacement: documentation has been updated.
load: mzxml import now support zlib compression.
Bug fix in mzXML loading: some mzXML contains a precursorMz entry without any ActivationMethod field. A test to ActivationMethod has been added in mzxml.jl.
Renaming to MSj.jl. This short name should be easier to remember (as it refers to MSn).

Renaming: MSJ.jl to be more inline with the package naming guidelines.
formula: public function. Parse a string containing the chemical formula to a dict{String, Int}.
isotopic_distribution: public function. Takes either the chemical formula or a dict{String,Int} and returns a set of isotopologues.
masses: public function. Takes either the chemical formula or a dict{String,Int} and returns the average, nominal and isotopic masses.
simulate: public function. From an isotpic distribution simulate a mass spectrum based on a resolution and a peak shape.

msfilter function is renamed average.
baseline_correction: public function. Corrects the baseline using TopHat, Iterative polynomial smoothing algorithm (IPSA) or Locally weighted error sum of squares regression (LOESS).
extract: public function. Extract a subset of a ms data.

Supported files: mzXML.
info: public function that reads the content of a file, but without loading the data.
load: public function that loads the content of a file.
chromatogram: public function that retrieves chromatograms from the content of a file.
msfilter: public function, returns the average mass spectrum either from a file or from a variable.
Filtering: msfilter and chromatogram by scan number, MS level, Polarity, Activation Method, Activation Energy, Precursor, retention time, ion current..
centroid: public function, performs peak picking from a file or a variable.
smooth: public function, smooth MS data on variable.