Changed parseEntity regex to remove Catastrophic Backtracking

[bstoney]

this fixes #61

[bstoney]

Any idea about why the test failed? I have rerun all the tests locally with both php 5.6 and 7.0 (7.0.2) and everything looks good. I have not had much experience with travis or AppVeyor, so might need some guidance to figure out the issue.

[bstoney]

I've retested after after updating to php 7.0.4 and it is failing. Looks like there has been a change to php unserialize since php 7.0.2 which is breaking this. php/php-src@bcd64a9 I'll look into it a bit more and see if those changes are causing the problem

[mishal]

Thanks for the PR. I have few points:

• please do not touch the test files from less.js (tests/ILess/Test/Parser/_fixtures/less.js/) - they are copied from the less.js project and used for compatibility comparison
• create a test case in Issues directory for this issue

I'm not sure what is the problem with serialize under PHP7, I don't have access to it.

[mishal]

Your fix is not the cause of the problem.
I restared old build and it failed under php 7:
https://travis-ci.org/mishal/iless/jobs/86137704

[mishal]

The problematic is import-reference.less with cache enabled. I will create separate issue for this.

[bstoney]

Ok thanks. I'll revert the css file and add in a new test case in my fork.