Update for iOS and MacOS build

[um68]

Most libs build now for iOS and MacOS
bru has new command line option to specify the targetPlatform which is required to build for iOS (by default, it would build for MacOS if run on MacOS).

[KjellSchubert]

Note the Travis build failed with:

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ERROR: tests 'bru install zlib', which is one of the simplest cases
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Traceback (most recent call last):
  File "/home/travis/build/KjellSchubert/bru/tests/test_install.py", line 171, in test_install_zlib
    install.cmd_install(library, ['zlib'])
TypeError: cmd_install() takes exactly 3 arguments (2 given)
======================================================================
ERROR: test_make_tinyjs (test_make.MakeTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/KjellSchubert/bru/tests/test_make.py", line 26, in test_make_tinyjs
    brulib.install.cmd_install(library, ['tiny-js'])
TypeError: cmd_install() takes exactly 3 arguments (2 given)

So you added an arg to some script func. Easiest would be to make this arg an optional Python arg (http://stackoverflow.com/questions/1769403/understanding-kwargs-in-python), alternatively update the tests using the modified func.

[coveralls]

Coverage decreased (-12.01%) to 67.82% when pulling 45e8a57 on um68:master into 50a21c9 on KjellSchubert:master.