additional tests where for relative path to @import less file

Improve css_loadfile() tests
- use TMP_DIR constant rather than /tmp
- swap order of parameters in csstest() to match reported 'expected' & 'actual'
- add tests for use of 'url()' in @import
- add te

Improve css_loadfile() tests
- use TMP_DIR constant rather than /tmp
- swap order of parameters in csstest() to match reported 'expected' & 'actual'
- add tests for use of 'url()' in @import
- add tests for @import of '.less' files (these test will fail per FS#2875)

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Added unit tests for CSS shorthand compression FS#2509

Updated tests, removed hash

update hashes in tests

fix some minor typos in fetch_imagetoken.test.php

tests for fetch.php of external files

add some dependency checks with test skips to fetch tests and tests which use TestResponse::headers

add test for fetch using image tokens

do not recompress already minified js FS#2574

Made multiline test cases work on windows too

Correctly handle multiline strings in JS compressor

See
http://stackoverflow.com/questions/805107/how-to-create-multiline-strings
for info on them.

removed unecessary requiresin unit tests

moved _testing to _test