Fix conflicting versions of uritemplate library

[mesemus]

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Description

This pull request fixes issue #299 - conflicting versions of the uritemplate library. Invenio sources in general use the uritemplate library, but this module uses the uritemplate-py library. Both of the libraries provide the same top-level uritemplate python module and the one used depends on the installation order.

In the pull request, the uritemplate-py library was replaced with uritemplate.

Note: it seems that invenio-theme 3.0.0 does not include flask-breadcrumbs anymore and this library depends on that. flask-breadcrumbs were added to test dependencies, not sure if it is correct.

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[jrcastro2]

LGTM! Just left a comment about removing flask-breadcrumbs, tests might fail in the meantime but we have to remove it as it's not needed anymore.We will fix the tests this afternoon most likely.