added default values

I added default values to two functions that were annoying me by their
requests for extra info
changed spacing to consistent style
Merge pull request #27 from CatherineH/master

added default values to two functions (zOptimize, zSetNSCSolve) and fix docstring information of zSetNSCSolve
minor addition of text in zemaxoperands
created zGetPOP and sample script
added a unit test for zGetPOP

the POP.CFG file should probably be used so that we can be sure to use
the same measurement settings every time.
docstring formatting for Sphinx based docs
Merge pull request #29 from CatherineH/master

Added POP function `zGetPOP()`, sample script in Examples directory, and unit-test for `zGetPop()`
Removed zGetPOP() function (temporarily)

Removed zGetPOP() function (temporarily) as there seems to be some
problem with it. It will be fixed in a separate branch before brining it
back.
New branch for minor fixed required for zGetPOP
added timeout to zGetText() function
updated zGetPOP() function
minor update to zGetPOP function
added method zCreatePOPSettings()

Helper function to quickly create settings file for POP data
minor fixes to docstring of zCreatePOPSettings
zCreatePOPSettings to zSetPOP..., modified zGetPOP

1. changed function name for setting POP analysis setting to
zSetPOPSettings() for consistency
2. added the ability to set Irradiance/Phase data settings to
zSetPOPSettings()
3. added logic to zGetPOP so that it can return both Phase and
Irradiance data
Completed POP data functions

Completed functions zGetPOP, zModifyPOPSettings and zSetPOPSettings,
along with a fiber coupling efficiency calculation example in
Example/Scripts and three unit-test functions
Merge pull request #30 from indranilsinharoy/fixPOPinfo

Updated all POP related functions, unit-tests and example
updated rev. number
fixed corner case in ipzCaptureWindow

The ``ipzCaptureWindow()`` function would fail if the lens file was in a
directory path that contains spaces. This error happened because
Imagick's convert couldn't handle spaces in directory path. The fix is
to enclose both the destination and source directory paths within double
quotes.