suit-issue-108: Adds configuration options and documentation for Saved Search

[nikhilj13]

Adds documentation and configuration options for saved searches, once pull request #110 for SUIT is approved (attivio/suit#110)
You can configure the zone (savedSearchZone), table name (savedSearchTable) and search workflow (savedSearchWorkflow) to be used for saved searches by using the corresponding options in the SearchBar. Below is an example:

// These properties configure only the default values for properties of any SearchBar components
  // that allow the user to enter their queries.
  SearchBar: {
    // The placeholder text to display when the input field is empty.
    placeholder: 'Search\u2026',
    // The placeholder text to display when the input field is empty and the language is advanced.
    placeholderAdvanced: 'Enter an advanced query\u2026',
    // If true, the "microphone" button is displayed beside the search bar and the user can use speech recognition to input the
    // query
    allowVoice: true,
    // Whether to show a toggle for simple/advanced language in the search bar
    allowLanguageSelect: true,
    autoCompleteUri: '/rest/autocompleteApi/richCgi/dictionaryProvider',
    // configures the search workflow used for saved searches, if empty the default search workflow is used
   savedSearchWorkflow: 'searchSavedSearches',
   // configures the table name for saved searches
   savedSearchTable: 'testTable',
   // specifies the index zone for saved searches
   savedSearchZone: 'testZone',
  },