Display all issues with a given label

[Rishabh570]

Fixes #79

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[Rishabh570]

Currently, hitting https://code.publiclab.org/examples/embed.html#o=publiclab&r=plots2&l=gci-candidate is giving only a list of 30 issues (which is not all of the issues), this is fixed by providing an option in the request which now returns all of the gci-candidate issues (80)...
@jywarren Please take a look...

[jywarren]

Oh this is great. Merging!!! Fantastic work, @Rishabh570 !!!