refactored elliptic curve isogeny classes to use their own class
new encode_plot function in utils
Use stored isogeny matrices instead of recomputing on the fly
Part 3 of elliptic curve refactoring: WebEC class
tidying up elliptic curve isogeny class page
Changing how subfields of a number field are stored.  We used to use a list of coefficients of a defining polynomial stored as integers, but ran over the 8-bit limit for mongo integers.  Now the coefficients are stored as a string.
Fix comment (error from copying/pasting from someone else's file).
Merge pull request #193 from JohnCremona/ec-refactor

Ec refactor
Merge pull request #192 from jwj61/master

Changing how subfields of a number field are stored.
Merge remote-tracking branch 'upstream/master'