Added ext requirements to composer
Added syntax sugar for throwing exception

Now we are able to throw strings, chars, doubles and integers
Fixed warning in isset
Missing separation in zephir_concat_self
Merge pull request #564 from nkt/feature/expression-exceptions

Added syntax sugar for throwing exception
Taking advantage of RETVAL_ZVAL_FAST in PHP 5.6
Merge branch 'master' of https://github.com/phalcon/zephir
Taking advantage of RETVAL_ZVAL_FAST in PHP 5.6 (2)
Removing invalid double separation for array parameters
Fix multidimensional array assignment, as variable, normal/static property

- Include tests for each type
String parameters must be copy-on-write'd when they're already strings
Support for hash pointer globals
Export destructors from config.json to extension
RETVAL_ZVAL_FAST needs more tests, fixing incremental build
Avoid SkipVariantInit when variable is used in evaluated expression
Merge pull request #562 from ovr/composer_use

Added ext requirements to composer
Merge pull request #575 from steffengy/fix-array-mod

Fix normal multi dimensional array assignment
typeof operator did not work with local variants
Implement setting an object's properties dynamically with strings

An object's properties can now be set by specifying a string instead of an
variable.
A not defined property of an object can now be set, using variables and
strings.

Tests for these cases are added, accessing different variables to ensure
that it works properly, if the property is not yet defined.