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Merge pull request #607 from dzhuang/new_dl_features

New downloading features along with adaptations to the new APIs

- Enable multiple subtitles and transcripts with alternatives.
Sometimes we need to download subititles in different languages, for example, 'en' and 'zh-CN', which is not supported currently. The PR enabled downloading multiple subtitles & transcripts, along with fallback for each language, by using the following format:
```
--subtitle-language <lang1,lang2|fallback1_for_lang2|fallback2_for_lang2>
```
This can will also be an alternative fix for #596 .
- Enable downloading resources blocks.
Some materials are now in a new blocks named ``Resources``, which corresponed to the new API ``onDemandReferences.v1``. Fixing #597 

- Enable file to store parameters.  
There are cases where there are too many parameters (besides username and password) to be set each time we download a course. I use ``configargparse`` to read configurations stored in a local file named ``coursera-dl.conf``. Fixing #97 

- Enable downloading new typename ``programming``
That is different from original ``gradedProgramming`` and ``ungradedProgramming`` so it is not recognized by coursera-dl currently. An example can be find at the end of [this page].
The new API is ``onDemandProgrammingImmediateInstructions.v1``.

- Allow alternative ``MathJax.js`` cdn url when downloading webpages, as the default [``MathJax.js`` url](https://cdn.mathjax.org/mathjax/latest/MathJax.js) is not accessible in some countries (this is the case at least for me).

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