Documentation update.
1. Renamed ceres.tex to ceres-solver.tex
2. Updated Solver::Options docs to reflect the recent changes.
3. Updated .gitignore to ignore ceres-solver.pdf
Change-Id: Iea19f8ff5fa1638a498422c8be5ed2e6da2950c9
diff --git a/docs/powell.tex b/docs/powell.tex
index d8aa8c8..7fc94a3 100644
--- a/docs/powell.tex
+++ b/docs/powell.tex
@@ -1,4 +1,4 @@
-%!TEX root = ceres.tex
+%!TEX root = ceres-solver.tex
\chapter{Powell's Function}
\label{chapter:tutorial:powell}
Consider now a slightly more complicated example -- the minimization of Powell's function. Let $x = \left[x_1, x_2, x_3, x_4 \right]$ and
