bump xdebug.max_nesting_level for Flow templating

<spagewmf> hey, Flow templating is hitting "Maximum function nesting level of
'100' reached, aborting!".  Setting xdebug.max_nesting_level to 200 in
/etc/php5/apache2/php.ini fixes it in labs-vagrant.  Is this going to be a
problem in production? (does production even run xdebug?)

Change-Id: I2ffb7658a553ba6b9f2957a9abbf2b5d106626d1
Merge "bump xdebug.max_nesting_level for Flow templating"