Add a GLSL test that compares a loop index to an uniform

Comparing a loop index to an uniform is useful in WebGL GLSL shaders,
since it can be used to work around the lack of while loops. Add a test
for this. The test is known to have failed on at least some older NVIDIA
Tegra drivers.
Add a test ensuring bufferData can handle different sizes

The buffer-sizes test will allocate buffers of different sizes ranging
from 3 kB to 4 TB, and ensure that either 1) the buffer is allocated with
the correct size and it is cleared before usage 2) the implementation
reports a gl.OUT_OF_MEMORY error or 3) the context is lost. Buffers <= 48
MB are expected to work on all implementations.

The test is placed in the extra folder because of the risk of losing the
context, which will cause problems in some current browsers if it happens
in the middle of conformance tests.
Merge pull request #387 from NVIDIA/extras-bufferdata-test

Add a test ensuring bufferData can handle different sizes
Merge pull request #388 from NVIDIA/compare-loop-index-test

Add a GLSL test that compares a loop index to an uniform
Increased tolerance in oes-standard-derivatives test from 2 to 5 on
request from Qualcomm.

This is essentially a bug fix and has therefore been applied to the
1.0.1, 1.0.2 and top-of-tree conformance suites.
Merge pull request #389 from kenrussell/standard-derivatives-tolerance

Increased tolerance in oes-standard-derivatives test from 2 to 5 on