updated section on local clustering coefficients
Added section on reciprocity and a couple examples of k-core usage in the literature
reworked first example to make use of igraph's maximal.cliques function
updated markdown for previous commit
Added k-core igraph example
Added section on signed edges and structural balance
Updated plots for clique section
Merge pull request #1 from ddarmon/master

Added files for measures and metrics, part I.
Fixed couple typos
Merge branch 'master' of github.com:khughitt/network-biology-study-group
Started working on a comparison section using DREAM4 simulated dataset
Added some k-core examples
Added kcliques DREAM4 example
Added transitivity and cluster coefficient examples
Switched to DREAM4 100-node dataset; added kclique plot
Increased the default figure size
Added kmeans example
Shortened dir names
Normalized expression data before computing kmeans clusters; added line plot of expression profiles
notes on section 8.1 through to section section 8.3