Comparison data for GMD paper Hector v0.1

Output data to reproduce the figures in the Hartin et al. GMD paper.
R scripts to process Hector output and comparison data.
Comparison data and R scripts for Hartin et al GMD paper

fix to ef97704.
Comparison Data for Hartin etal GMD Hector v0.1 paper
R scripts for processing comparison data and Hector output and accompanying mapping files needed
Update README.md

added the link for the GMD paper
adding new OH component

not fully functioning yet
updates to gitnore

deleted VS files
added N2O emis to concentrations
more changes to n2o/ch4/oh/o3
n2o
Working N2O component

converts from emissions to concentrations
changes to initial lifetime
Merge branch 'ch4/n2o'

Conflicts:
	project_files/visual_studio/hector/hector.sdf
	project_files/visual_studio/hector/hector.suo
Add #include<math.h> to files that have math functions.
Time series containing only a single value now acts like a constant

That is, it returns its lone value irrespective of what time was
passed in.  This behavior may seem surprising at first glance, but it
does the right thing for the cases where the situation arises in
practice (namely, during spin-up), and it is a reasonable
generalization of what we mean by a time series.

Fixes #38
Merge pull request #40 from JGCRI/fix-timeseries

Fix timeseries
ch4 and oh  updates
deleting/removing visual studio files.
Merge branch 'ch4/n2o'
Removed VS porject files