markup: fix float texture size when using pil markup rendering. closes #1082

credits to ihaque

kivy/core/text/markup.py

@@ -37,13 +37,13 @@ If you need to escape the markup from the current text, use
 
 __all__ = ('MarkupLabel', )
 
-from kivy.graphics.texture import Texture
+import re
 from kivy.properties import dpi2px
 from kivy.parser import parse_color
 from kivy.logger import Logger
-import re
 from kivy.core.text import Label, LabelBase
 from copy import copy
+from math import ceil
 
 # We need to do this trick when documentation is generated
 MarkupLabelBase = Label
@@ -216,7 +216,7 @@ class MarkupLabel(MarkupLabelBase):
                 h = 1
             else:
                 h = sum([line[1] for line in lines])
-        return w, h
+        return int(ceil(w)), int(ceil(h))
 
     def _pre_render_label(self, word, options, lines):
         # precalculate id/name