Update README.md

I updated d-apt repository link.
Replace vibe install command by dub install because
Jordi's APT repository does't provide ``vibe`` package.
Updated DMD version.

Any way ``./setup-linux.sh`` doesn't work on Debian Wheezy:
Error:
```
Building configuration "application", build type debug
Running dmd (compile)...
Error: Executable file not found: 

Run 'dub help' for usage information.
```
Cleaned all legacy stuff in resutil module.

Also moved some generic utilities from rest to restutil.
Deprecate 'index' special behavior.

Add pragma wich recommends transition to UDA's for "/" path definition.
Clean REST example for using 'index'.
Removed 'index' usage from docs.
Enable BSON and JSON serialization/deserialization of enum strings
Merge pull request #254 from yazd/bson-enum-fixes

Enable BSON and JSON serialization/deserialization of enum strings
Merge pull request #258 from Dicebot/deprecate_index

Deprecate index() special meaning in the REST interface generator.
Merge pull request #259 from Dicebot/rest_cleanup

Cleaned all legacy stuff in resutil module.
Remove the WinAPI+WinRT support code (too limited to be useful) and implement a timer based on DispatcherTimer.
Give a hint where a JSON format error was detected.
Avoid bogus error message.
Fix inversion in writeBson for bools.
Merge pull request #260 from biozic/master

Fix inversion in writeBson for bools.
Make allocators shared - due to D's GC this will cause bad memory bugs otherwise.

Specifically, the "nice" property of the GC to call finalizers in different threads than the constructor - even for thread-local objects - would cause an object to be deallocated by a different allocator than the one that allocated it.
Add an allowed_chars parameter to urlEncode().
Implement deregisterLogger().
Merge pull request #262 from zealotous/patch-1

Update README.md
Group the second overload of registerRestInterface under the same DOC comment.
fix the buggy function parseRFC822DateTimeString
Merge pull request #264 from carlor/fix_rfc822

Fix the buggy function parseRFC822DateTimeString