Fix PubMed Searching

[GlazerMann]

Do not URL encode DOIs. They must have changed API. (This gives us PMID in test)
Also, after we find a PMID, we then look for a PMC. (This then gives us PMC in test case)
Also added quotes around search terms.

[codecov]

Codecov Report

Merging #534 into master will decrease coverage by 2.88%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #534      +/-   ##
============================================
- Coverage     75.73%   72.85%   -2.89%     
- Complexity     1446     1449       +3     
============================================
  Files             9        9              
  Lines          2477     2479       +2     
============================================
- Hits           1876     1806      -70     
- Misses          601      673      +72

Impacted Files	Coverage Δ	Complexity Δ
Template.php	79.81% <100%> (-3.99%)	1297 <0> (+3)

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