set force close only when dealing with top frames
bump version to 0.8.7-rc1
Fix: set force close only when dealing with top frames

Fix the previous commit in a better way to simulate the previous
solution (but do it from renderer): only try to set the flag on
the first time.
Updated symbol generation process.

Now the 'dist' target will depend on nw, chromedriver and symbols. All
these binaries will be packed into 'dist' folder under out/Release
Added aws upload support
Merge pull request #1883 from libm/v0.8

cherry-pick two patches (updated package generator, added symbol support)
switch back to chromedriver2_server for v0.8 (before renaming)
Merge pull request #1884 from libm/v0.8

switch back to chromedriver2_server for v0.8 (before renaming)
Build script updates picked from v0.9
Merge pull request #1899 from libm/v0.8

Build script updates picked from v0.9