1. Renamed methods sets to remove ambiguity :
 1.1. ObjectXmlExtensions.Xml() -> ObjectXmlExtensions.ToXml()
 1.2. TextReaderXmlExtensions.Xml() -> TextReaderXmlExtensions.AsXml()
 1.3. StreamXmlExtensions:
   - Xml() -> AsXml(),
   - XmlDocument() -> AsXmlDocument()
   - XDocument() -> AsXDocument()
 - StringXmlExtensions.Xml() -> StringXmlExtensions.AsXml()
2. Added new extension methods
  2.1. TimeSpanExtensions :
    - FromNow()
    - FromNowUtc()
    - BeforeNow()
    - BeforeNowUtc()
  2.2. StringExtensions :
    - Capitalize()
    - Lines()
    - Prepend()
    - SwapCase()
  2.3. DateTimeExtensions :
    - Friday()
    - Monday()
    - Saturday()
    - Sunday()
    - Thursday()
    - Tuesday()
    - Wednesday()
  2.4. NumericExtensions :
    - Days()
    - Hours()
    - Minutes()
    - Seconds()
    - Milliseconds()
    - Ceil()
    - Floor()
    - Power()
    - Round()
    - Sqrt()
    - Even()
3. Removed StringExtensions.EachLine() method