Profile parsing problem

In profile.py, the env doesn’t work if the value contains a ‘=’, the code is using simple split which does not cover this case.

        for env in doc.env.split("\n"):
            if env:
                varname, value = env.split("=")
                obj.env[varname] = value

Also when an error happens when parsing the profile file, it reports error as cannot find this profile, and the message looks like

RROR: Specified profile 'gcc62' doesn't exist.
Existing profiles: gcc62, gcc4.8.3

which is confusing.

[NingyuShi]

@memsharded The case is

CXX_FLAGS="-DAAA=0"

[memsharded]

Fixed in #608, will be released in next 0.15