ENH: jit the 1d quadrature routines

[sglyon]

This just jits the 1-dimensional quadrature routines.

The multi-dim ones are implemented using higher order functions, so they still will not work in nopython mode.

[coveralls]

Coverage decreased (-0.07%) to 94.768% when pulling ad8d62f on sl/jitquad into 5ac0f83 on master.

[sglyon]

This is now ready for review/merge

[mmcky]

@sglyon the function signature seems to no longer correspond to the docstring.

[mmcky]

Nice -- thanks @sglyon.

[mmcky]

Does this need any additional tests.
This isn't usually the case as the jit is usually tested as part of an overall function.

[mmcky]

@sglyon do you by chance have any performance comparison. No worries if you don't but if you had a ROM then I would include that in the release notes.

[sglyon]

I don't have performance comparisons.

I did this not because of potential performance gains from calling it, but rather so I can call these routines inside other nopython jitted functions.

Good catch regarding the docstring, I'll fix that up

[mmcky]

Thanks @sglyon - ok cool - that's a good reason. When (!) I get performance tracking up and running then it will pick up these kind of commits anyway from the git history.

[sglyon]

Ok, docstrings updated!

[coveralls]

Coverage decreased (-0.07%) to 94.769% when pulling 58125fa on sl/jitquad into 5ac0f83 on master.

[mmcky]

thanks @sglyon.