Alpha release of the upcoming 3.0 version

Major update since the 2.9 version. Highlights:

• Updated NEBM class

  • Option to set both climbing and falling images
  • Added new integrators (Verlet)
  • Updated calculation of geodesic angle
  • Removed old Cartesian NEBM class
  • Restructured C libs
  • Added more tests

• Added String method as an alternative to NEBM. So far only working with Verlet integrator

• Moved String/NEBM to a new chain methods class

• Updated Fidimag build file to avoid repeated Cython compilations

• Updated micromagnetic DMI class with more DMI terms and more simple way to implement new DMI types

• Updates to demag class

• Updates to the TimeZeeman class

• Started tracking Fidimag citations

• Trying to fix Travis build

  • Notebooks are now in a separate build but still need to be updated to pass the nbval tests

• Added Steepest Descent method as a minimiser class

• In progress:

  • Fast Multipole method
  • VTK writer in C to speed up output files and remove pyVTK dependency