Added option to set maximum icon size

[lordcodes]

This pull request allows setting maximum icon size through the following methods:

• to a default limit of 32dp (based from the platform AlertDialog)
  • limitIconToDefaultSize() builder method
  • md_icon_limit_icon_to_default_size global theme attribute
• to a specified maximum size
  • maxIconSize(int maxIconSize) builder method
  • md_icon_max_size global theme attribute

This feature was requested in #297.

[Gaudon]

Great work, if it all checks out I hope afollestad merges it in. Something I will be utilizing immediately.

[afollestad]

Looks great, it's simple and clean enough to trust, I'll merge it now and test it later. Thanks!

[lordcodes]

Thanks!

[afollestad]

I improved this with a maxIconSizeRes() method too

[afollestad]

Release 0.6.3.5 is now available.

https://github.com/afollestad/material-dialogs/releases/tag/v0.6.3.5

[Gaudon]

Yeah I tested this earlier this evening, seconds after it was released and it seems to be working perfectly. Quite handy for my use case!

Cheers gentleman.

[sevar83]

A small mistake in the README. The lines

< attr name="md_icon_max_size" format="dimension" />
< attr name="md_icon_limit_icon_to_default_size" format="boolean" />

should be something like this:

< item name="md_icon_max_size">32dp
< item name="md_icon_limit_icon_to_default_size">true

[usernotnull]

please update readme as suggested above, cheers