Allow .conservativeResize(rows,cols) on vectors
Make index type of Triplet default to SparseMatrix::Index as suggested by Kolja Brix. Fixes Bug 665.

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extra : source : 6d0a7ec5f2cd4d628e56293ca2beb9aa6fb461c0
Use != instead of < to check for emptiness of iterator range (fixes Bug 664)

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extra : source : 2261621dfdcdd7f48526f77df2b5d812fc84e9e7
Fix bug 674: typo in documentation example for BiCGSTAB. They are now proper snippet files.
Fixes Bug 681
Also fixed some spelling issues in the documentation