fplot.plot() acceptor line is dashed
.save() auto adds '.exp' to self.filename
Merge branch 'master' of github.com:cfperez/smbanalyze
UPDATE stiffness in constants.py
UPDATE WLC parameters in curvefit.py
FEATURE experiment.List() for collections of experiments

List() inherits from abstract class Sequence and implements
.next(): cycles through all items, returning each

.matching(): takes string arguments, returning a List() of matching
filenames

.plotall(): plots all of the experiments

__repr__(): Prints index for easier access

In the future, can implement more macro-like functions which allow
quicker curve fitting, as well as global fits/analysis on multiple
experiments.