Allow Subscribe/Unsubscribe to be called without ajax

[hailwood]

As discussed in #204

[codecov-io]

Codecov Report

Merging #205 into master will decrease coverage by 0.45%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
- Coverage   53.66%   53.21%   -0.46%     
==========================================
  Files          11       11              
  Lines        2115     2118       +3     
==========================================
- Hits         1135     1127       -8     
- Misses        980      991      +11

Impacted Files	Coverage Δ
code/pagetypes/Forum.php	58.75% <0%> (-1.34%)	:arrow_down:

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[hailwood]

Hey @dhensby ; Any update on merging this in?

I'm aware that i've lowered code coverage slightly by introducing new lines in a section that isn't tested at all; but I currently don't have enough open-source time to write tests for the entire subscription system..

[dhensby]

Thanks