[ADD] addEmojis returns immediately if useSystemDefault
[ADD] useSystemDefault in Emojicon attibutes and TextView/EditText
[ADD] useSystemDefault in EmojiAdapter
[ADD] useSystemDefault in EmojiGridFragment
[ADD] useSystemDefault in EmojiconsFragment
[ADD] useSystemDefault in EmojiconRecentsGridFragment
[UPDATE] example can switch useSystemDefault by code
[ADD] example now has a checkbox that can switch between use system default emojicon and use custom ones (EditText/TextView need to be fixed)
[UPDATE] lower min sdk version requirement to 7
[UPDATE] suggested fixes
[UPDATE] suggested fixes
Many emoji were not being saved and loaded correctly.
Merge pull request #23 from KTachibanaM/systemDefaultEmojicon

System default emojicon
Merge pull request #27 from tictocplanet/fix-recents-saving

Many emoji were not being saved and loaded correctly.
The performance quickly decreased as the limitless recent list grew.
Added the ability to externally set the maximum size of the recent emoji list.
Merge pull request #28 from tictocplanet/limit-recents-list-size

The performance quickly decreased as the limitless recent list grew.
Immediately update the EditText contents when the emojicon size is changed.

Conflicts:
	library/src/main/java/com/rockerhieu/emojicon/EmojiconEditText.java
Removed uses of the "this" keyword.
The emojicon size was not consistently taking effect when it was set after the text was set.