If the given tstart is before the minStartTime this will error - so
instead, select the minStartTime

Previously, if the data span was shorter than the requested tstart-tend,
the code would choke when attempting to calculate twoF over a range
without any data. Instead, the code now automatically only compute twoF
over a range with data in it.

CI was failing when calling the new injection_helper_functions module as
anaconda attempted to update numpy (unknown reason)

1) Add ability to in F0s, F1s etc in grid search directly (use tuple as (is)
2) Update cumulative legend
3) Add option to produce pfs_input directly to calculate_pfs
4) Fix spelling mistake
5) Update transient example in the paper

1) Adds check if the truths are not of the correct length (to prevent
corner.corner error)
2) Improve sliding window labels
3) Adds option to plot gps seconds on the sliding window

A search, based on Reinhard's J0537-6910 work, in which the search is
performed over F0 in a sliding window. Able to track changes in the
power and frequency of the signal.

- Adds option to underplot the preducted Fstat 1-sigma variation in
  twoF_cumulative plots
- Adds isolated function to predict Fstat (wrapper to lalapps function)
- Adds detector colours dictionary: use elsewhere

- Expose generate_loudest
- add check if par exists
- All read_par to read_loudest
- Make the default save_fig to be True in plot_corner

No longer saves the emcee sampler itself to the pickle. This was done in
response to a bug encountered by David Keitel in which while dumping the
pickle an error was raised. Fixes #1

Requirement is matplotlib>=1.4 in order to use the style package. Make the
default context ggplot (available in 1.4) and add an error message to
help the user when they have selected one which does not exist.

Makes this an optional module, adds it to the requirements and README.md