Fix download url discrepancy.

[krmahadevan]

After 2.7.0 it looks like the following has changed

1. The standalone binary name has changed from
   “allure” to “allure-commandline”

This changes captures the change in the standalone
binary name and also accommodates the url suffix
pattern for the newer version downloads.

[CLAassistant]

All committers have signed the CLA.

[krmahadevan]

ping @baev - Please help take a look and merge

[krmahadevan]

@baev - Is there anything pending from my side, before this can be merged?

[krmahadevan]

@baev - Thanks for helping with the merge. Considering the fact that without this change-set its not possible to use the latest released version of allure plugin (2.12.1) in Bamboo because the generated report is all skewed up because Bamboo plugin ends up downloading 2.7.0 version of the standalone (which used to be called as allure.zip), can you please let me know if there are plans on releasing another version of the bamboo plugin ?

Right now, I have had to apply this fix locally, build a jar and coax my devops team to install this offline plugin instead of grabbing the plugin from the marketplace.