* `matrix-client-crypto.spec.ts` only tested a very specific bit of crypto (olm
encryption). It goes back to the very early days, before Megolm was invented.
I've renamed it to `olm-encryption-spec.ts`.
* `megolm-integ.spec.ts` is more of a general crypto test; it was just called
`megolm` to distinguish it from the Olm tests above. Renamed to
`crypto.spec.ts`.
