allow setting filter conditions as functions

[lsloan]

KalturaApiClient currently allows conditions of various filters to be set via assignment. Like this…

mediaFilter = KalturaMediaEntryFilter()
mediaFilter.categoriesMatchAnd = categoryFullName
mediaFilter.typeIn = (1, 2, 5)

It would be helpful to allow these conditions to be set as function calls, too. Additionally, the functions should support fluent coding, so they may be chained together. For example…

mediaFilter = (KalturaMediaEntryFilter()
  .categoriesMatchAnd(categoryFullName).typeIn((1, 2, 5)))