2015-06-23: Added tag v0.8.4 for changeset a4bca2a0f2f6 stable

Added tag v0.8.4 for changeset a4bca2a0f2f6

diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -27,3 +27,4 @@ 0e702c268e6fdc9c52f034b6553c940b09c16400
 8eaf023f5d3bc20ad4b795cde3a92e3b5c242dba v0.8.1
 327acbae68ef4efbf77734f0ee20359ed559ce0d v0.8.2
 41c48043ca33bf47311a93d0545b13a0578c3cf0 v0.8.3
+a4bca2a0f2f6659d97b1db471ae9803119b80529 v0.8.4