Add justify to theme options

Fixes: https://launchpad.net/bugs/802252

openlp/core/lib/htmlbuilder.py

@@ -557,11 +557,15 @@ def build_lyrics_format_css(theme, width, height):
         left_margin = int(theme.font_main_outline_size) * 2
     else:
         left_margin = 0
-    lyrics = u'white-space:pre-wrap; word-wrap: break-word; ' \
+    justify = u'white-space:pre-wrap;'
+    # fix tag incompatibilities
+    if theme.display_horizontal_align == HorizontalType.Justify:
+        justify = u''
+    lyrics = u'%s word-wrap: break-word; ' \
         'text-align: %s; vertical-align: %s; font-family: %s; ' \
         'font-size: %spt; color: %s; line-height: %d%%; margin: 0;' \
         'padding: 0; padding-left: %spx; width: %spx; height: %spx; ' % \
-        (align, valign, theme.font_main_name, theme.font_main_size,
+        (justify, align, valign, theme.font_main_name, theme.font_main_size,
         theme.font_main_color, 100 + int(theme.font_main_line_adjustment),
         left_margin, width, height)
     if theme.font_main_outline:

openlp/core/lib/theme.py

@@ -176,8 +176,9 @@ class HorizontalType(object):
     Left = 0
     Right = 1
     Center = 2
+    Justify = 3
 
-    Names = [u'left', u'right', u'center']
+    Names = [u'left', u'right', u'center', u'justify']
 
 
 class VerticalType(object):

openlp/core/ui/themewizard.py

@@ -246,7 +246,7 @@ class Ui_ThemeWizard(object):
         self.horizontalLabel = QtGui.QLabel(self.alignmentPage)
         self.horizontalLabel.setObjectName(u'HorizontalLabel')
         self.horizontalComboBox = QtGui.QComboBox(self.alignmentPage)
-        self.horizontalComboBox.addItems([u'', u'', u''])
+        self.horizontalComboBox.addItems([u'', u'', u'', u''])
         self.horizontalComboBox.setObjectName(u'HorizontalComboBox')
         self.alignmentLayout.addRow(self.horizontalLabel,
             self.horizontalComboBox)
@@ -495,6 +495,8 @@ class Ui_ThemeWizard(object):
             translate('OpenLP.ThemeWizard', 'Right'))
         self.horizontalComboBox.setItemText(HorizontalType.Center,
             translate('OpenLP.ThemeWizard', 'Center'))
+        self.horizontalComboBox.setItemText(HorizontalType.Justify,
+            translate('OpenLP.ThemeWizard', 'Justify'))
         self.transitionsLabel.setText(
             translate('OpenLP.ThemeWizard', 'Transitions:'))
         self.areaPositionPage.setTitle(