Added simple filtering and property value comparison.

[Phando]

Added two new functions to handle filtering (filter) and testing for object property value testing (hasPropertyEqual).

bool hasPropertyEqual(const char* key,  const char* value) const;  
bool hasPropertyEqual(const char* key,  const JSONVar& value) const;  
bool hasPropertyEqual(const String& key,  const String& value) const;  
bool hasPropertyEqual(const String& key,  const JSONVar& value) const;  

JSONVar filter(const char* key, const char* value) const;
JSONVar filter(const char* key, const JSONVar& value) const;
JSONVar filter(const String& key, const String& value) const;
JSONVar filter(const String& key, const JSONVar& value) const;

bool hasPropertyEqual returns true if the JSONVar has a property named key and that key is equal to value. myVar[key] != null && myVal[key] == value

JSONVar filter returns a JSONVar object containing objects who have properties named key and values matching value.

If no values are found it returns JSONVar(NULL, NULL) If one value is found it returns a JSONVar Object If multiple values are found it returns a JSONVar Array.

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