feature: align cover svg to viewer

[wolasss]

These changes allow to call:

viewer.fitToViewer(ALIGN_COVER, ALIGN_COVER) so that the svg will always take the whole viewport and match the viewport by the short edge.

Please review and let me know if there is something else I must add

[wolasss]

It fixes #29

[coveralls]

Coverage increased (+0.7%) to 39.652% when pulling a31979e on wolasss:master into 1b3bb5e on chrvadala:master.

[wolasss]

@chrvadala hey, any chances this will be merged soon? :)

[chrvadala]

Hi, thanks for your contributions.
I added few feedbacks inline; moreover, can you provide some unit tests?

Finally, let me to suggest you to align your PR with the add-test branch https://github.com/chrvadala/react-svg-pan-zoom/tree/add-tests, because I'll merge it in the next few days

[chrvadala]

Hi, thanks for your contributions.
I added few feedbacks inline; moreover, can you provide some unit tests?

Finally, let me to suggest you to align your PR with the add-test branch https://github.com/chrvadala/react-svg-pan-zoom/tree/add-tests, because I'll merge it in the next few days

quick update: add-tests is merged! you can sync your branch with master

[wolasss]

Ok, thanks, I'll address all the issues after the weekend

[wolasss]

@chrvadala I added some unit tests - for two scenarios where rect > viewport and the opposite. Both cases seem to be working fine. I also removed the package-lock.json and removed the blank lines.

[chrvadala]

Released with version 3.8.0
Thanks for your contribution, I added you in contributors list