Bump version to 0.8.0-SNAPSHOT
DRILL-1818: Fix complex projection pushdown

Also fixes:
Issue where converted type was lost when projecting two elements in a repeated type
Issue when selecting multiple elements in a repeated type, but using inconsistent casing
DRILL-1821: Fix issue where schema changes for previously defined field.
DRILL-1822: Update direct memory access operations to always be protected by bounds checking unless specifically disabled using the system property -Dbounds=false and Java assertions are also disabled.
update patch review tool to use send-email