Fix case sensitivity in search fields and filter alias matching

lib/query_helper.rb

@@ -282,7 +282,7 @@ def search_filter(column_maps)
       raise ArgumentError.new("search_fields not defined") unless @search_fields.length > 0
       placement = :where
       maps = column_maps.select do |cm|
-        if @search_fields.include? cm.alias_name
+        if @search_fields.any? { |sf| sf.casecmp?(cm.alias_name) }
           placement = :having if cm.aggregate
           true
         else

lib/query_helper/sql_filter.rb

@@ -17,7 +17,7 @@ def create_filters
 
       @filter_values.each do |comparate_alias, criteria|
         # Find the sql mapping if it exists
-        map = @column_maps.find { |m| m.alias_name == comparate_alias }
+        map = @column_maps.find { |m| m.alias_name.casecmp?(comparate_alias) }
         raise InvalidQueryError.new("cannot filter by #{comparate_alias}") unless map
 
         # create the filter

lib/query_helper/version.rb

@@ -1,3 +1,3 @@
 class QueryHelper
-  VERSION = "0.4.4"
+  VERSION = "0.4.5"
 end