Switch to using an aggregated logs query and infinite scrolling

This should allow users to work with large logs set.

Fixes #294

data/migrations/versions/5232a5610a0a_add_logentry_repo_datetime_kind_index.py

@@ -0,0 +1,26 @@
+"""Add LogEntry repo-datetime-kind index
+
+Revision ID: 5232a5610a0a
+Revises: 437ee6269a9d
+Create Date: 2015-07-31 13:25:41.877733
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '5232a5610a0a'
+down_revision = '437ee6269a9d'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade(tables):
+    ### commands auto generated by Alembic - please adjust! ###
+    op.create_index('logentry_repository_id_datetime_kind_id', 'logentry', ['repository_id', 'datetime', 'kind_id'], unique=False)
+    ### end Alembic commands ###
+
+
+def downgrade(tables):
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index('logentry_repository_id_datetime_kind_id', table_name='logentry')
+    ### end Alembic commands ###