Lightweight implementation of IOC Container

Refactored:

• XMLBeanDefinitionParser -> NPE surrounded with try /catch clause
• XMLBeanDefinitionParser -> Import tag processing included
• XMLBeanDefinitionParser.DOMParserContextXML(File contextXMLFile) -> equal("") replaced with isEmpty
• Implement SAX Parser
• Tests for Parsers are fixed / extended
• ClassPathApplicationContext -> changed methods access level to package
• Test for Bean without default counstructor
• ClassPathApplicationContext.createBeansFromBeanDefinition() -> added processing exception during bean instantiation. Tests are added for the same
• ClassPathApplicationContext.injectDependencies() -> Added Byte and Short datatype. Check qestion #3
• injectDependencies / injectRefDependencies fixed to go through the dependency Map
• getBean methods refactored to use correct generics and interface calls
• Added AllDataTypes test
• Added Injector / ValueInjector / ReferenceInjector. User Template Pattern
• Refactored names of packages and classes
• equals comparison corrected
• Tests on groovy
• BeanFactoryPostProcessor processing implemented
• BeanPostProcessor processing implemented