Create package.json

There may be some benefits to having a package.json, but the primary reason i'm interested in submitting this is for the jspm override entry, with it we can include select2 as simply as:

http://jsbin.com/upOtaXIR/2/edit

Any questions please shout!
Correcting git repository url
Fixed dpi warning [Fixes #1964]
Merge pull request #1943 from Jarreddebeer/patch-1

Create package.json
Update package.json on release
Changed default text for min number of characters.

Use to read:
Please enter 3 more characters.
Now reads:
Please enter 3 or more characters.
Merge pull request #2037 from codemumbler/patch-1

Changed default text for min number of characters.
singleSelect: setting nextSearchTerm in initSelection

For single select the nextSearchTerm callback is called when
initSelection returned data
Merge pull request #2044 from sieppl/master

singleSelect: setting nextSearchTerm in initSelection
Accessibility updates based on jQuery UI Autocomplete
Merge pull request #1816 from funkjedi/accessibility

Accessibility updates based on jQuery UI Autocomplete
Add hideSelectionFromResult function
Fix for #2042 Chrome bug: Reset the background position for multiple backgrounds
Use dppx instead of non-existing ppx resolution unit
Merge pull request #2057 from mkurz/dppx_fix

Use dppx instead of non-existing ppx resolution unit
Merge pull request #2056 from mkurz/fix_2042

Reset background position for multiple backgrounds [Fixes #2042]
Merge pull request #2053 from jdecuyper/feature-hide-selection-from-result

Add hideSelectionFromResult function
Merge branch 'master' into 4.0-wip

Updated 4.0 to include new additions to the master