Restructure output, add tests

[d3ming]

• Write to /tmp/tagcompare instead of the working directory of the project
• Restructure output so compare/capture are done under the same jobid. Closes Restructure output to be more sensible #14
• Support different tag types. Closes Support js tags #19
• Add more unit and integration tests!

Integration test coverage now at 85%!

$ make test-all
------------------------------------------ coverage: platform darwin, python 2.7.10-final-0 -------------------------------------------
Name                    Stmts   Miss  Cover   Missing
-----------------------------------------------------
tagcompare/__init__         0      0   100%
tagcompare/capture         80     19    76%   21-22, 33-34, 49, 70-71, 82-85, 114, 116, 134-139
tagcompare/compare         95     33    65%   27-28, 56, 73-74, 76-77, 82, 110, 113, 119-144, 148-152
tagcompare/image           61      4    93%   21-24, 101
tagcompare/logger          41      0   100%
tagcompare/output         139     19    86%   39, 43, 59, 63, 79, 106, 166, 170-172, 175-177, 180-182, 215, 225-226
tagcompare/placelocal      68     17    75%   28-29, 61-62, 67-69, 73-75, 97, 104-105, 117-121
tagcompare/settings        77      0   100%
tagcompare/webdriver       69      3    96%   52-54
-----------------------------------------------------
TOTAL                     630     95    85%

Unit test coverage now at 62%:

$ make test
------------------------------------------ coverage: platform darwin, python 2.7.10-final-0 -------------------------------------------
Name                    Stmts   Miss  Cover   Missing
-----------------------------------------------------
tagcompare/__init__         0      0   100%
tagcompare/capture         80     68    15%   19-44, 48-52, 68-89, 95-124, 134-139
tagcompare/compare         95     33    65%   27-28, 56, 73-74, 76-77, 82, 110, 113, 119-144, 148-152
tagcompare/image           61     10    84%   21-24, 84-92, 101
tagcompare/logger          41      0   100%
tagcompare/output         139     32    77%   39, 43, 59, 63, 79, 105-117, 143-145, 166, 170-172, 175-177, 180-182, 215, 225-226
tagcompare/placelocal      68     50    26%   17-18, 23-41, 53-75, 94-108, 117-121
tagcompare/settings        77      0   100%
tagcompare/webdriver       69     49    29%   18-21, 29-40, 50-60, 64, 69-81, 85-88, 94-105, 109-113
-----------------------------------------------------
TOTAL                     630    242    62%