Merge pull request #4 from vincentlab/develop

version 0.2.2
Add HLLC Riemann Solver

	new file:   pyfr/solvers/euler/kernels/rsolvers/hllc.mako

	new file:   pyfr/solvers/euler/kernels/rsolvers/hllc.mako
Merge pull request #26 from FreddieWitherden/develop

Refactor the Time Steppers and Add Filtering
Fix the Couette flow test case.
Merge pull request #25 from hpdavis1/develop

Addition of HLLC Riemann Solver.
Added Roes Riemann Solver
Merge pull request #29 from BrianVermeire/develop

Added Roes Riemann Solver.
Updated User Guide in preparation for v0.2.3.
Merge pull request #30 from pv101/develop

Updated User Guide in preparation for v0.2.3.
Merge pull request #27 from FreddieWitherden/develop

Towards v0.2.3
Update the version number for v0.2.3.
Update the AUTHORS file
Merge branch 'release/v0.2.3' into develop.
Merge remote-tracking branch 'upstream/develop' into develop.