Improved Blade Compiler speed in 13.5 times. Called the new compiler - B...

...lade2. Didnt want to replace old Blade as it requires good thorough testing and output is not exaclty the same (difference in line endings).

Speed was tested this way:

```

    public function testCompileSpeed()
    {
        $data = file_get_contents('/path/to/file/template.blade.php');


        $compiler = new Blade2Compiler($this->getFiles(), __DIR__);

        $start = microtime(true);
        for($i = 0; $i < 1000; $i++) {
            $compiler->compileString($data);
        }
        $time = microtime(true) - $start;

        $this->assertEquals('', $time); //bad way - but coded it in 2 secs so acceptable for temporary testing
    }

```

And then I inserted the same function into BladeCompilerTest (and changed Blade2Compiler to BladeCompiler).
Blade2Compiler has shown `1.99 seconds`; BladeCompiler - `27.07 seconds`. So I improved compile speed in 13.5 about times :)

This is due to reduced usage of regular expressions.

Also, This new Blade2 compiler passes 2 new tests which old Blade2 was unable to:

```
public function testCustomPhpCodeIsCorrectlyHandled()
    {
        $compiler = new Blade2Compiler($this->getFiles(), __DIR__);
        $this->assertEquals('<?php if($test): ?> <?php @show(\'test\'); ?> <?php endif; ?>', $compiler->compileString("@if(\$test) <?php @show('test'); ?> @endif"));
    }

    public function testMixingYieldAndEcho()
    {
        $compiler = new Blade2Compiler($this->getFiles(), __DIR__);
        $this->assertEquals('<?php echo $__env->yieldContent(\'title\'); ?> - <?php echo Config::get(\'site.title\'); ?>', $compiler->compileString("@yield('title') - {{Config::get('site.title')}}"));
    }
```

Compilers are fully compatible and Blade2 passes all phpunit tests of Blade. But there is small issue - on a real template they produce not exactly same output - difference is in line endings (LF\CR). Old blade uses '\r\n' but Blade2 uses native file endings (except thing with `@extends` where for compatibility I added \r\n to pass phpunit test).

You're welcome to test speed and compatibility yourself :)