Fix @polyvar macro when package is imported

[rdeits]

@polyvar x only works when the package has been included with using, rather than import, because it tries to use the PolyVar() defined in the context in which the macro is called, rather than the context in which it was defined. This change should fix that.

[codecov-io]

Current coverage is 70.87% (diff: 100%)

Merging #1 into master will not change coverage

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  Hits            494        494          
  Misses          203        203          
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Powered by Codecov. Last update dbf3a3a...3f2dab8

[coveralls]

Coverage remained the same at 71.037% when pulling dd0d46f on macro-hygiene into 98be11f on master.

[blegat]

Good catch !
I know that my package has an indentation mixed between 4 spaces and 2 spaces but I am trying to convert everything to 4 spaces :)

[blegat]

Could you use 4 spaces indent here ?

[rdeits]

done

[blegat]

I did the big reindent commit before merging your pull requests so that git blame remains accurate. Could you rebase #1 #2 ?

[rdeits]

Ok, this one is rebased.

[coveralls]

Coverage remained the same at 70.875% when pulling 3f2dab8 on macro-hygiene into dbf3a3a on master.

[coveralls]

Coverage remained the same at 70.875% when pulling 3f2dab8 on macro-hygiene into dbf3a3a on master.

[coveralls]

Coverage remained the same at 70.875% when pulling 3f2dab8 on macro-hygiene into dbf3a3a on master.

[coveralls]

Coverage remained the same at 70.875% when pulling 3f2dab8 on macro-hygiene into dbf3a3a on master.