Translated
Completed translation of '09-Index_creation_options_sparse' into Spanish. Fix #231.
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Updated according to feedback
Translated
Merge pull request #237 from jcarlosgarcia/using-explain

Completed translation of "11-Using_Explain" parts a and b. Resolves #233
Minor edits for #231.
Added Huboard link to README.rst.
Updated according to feedback
Updated according to feedback
Merge pull request #239 from jcarlosgarcia/when-index-used

Completed translation of "12-When is an index used" parts a and b. Resolves #234
Merge pull request #243 from jcarlosgarcia/how-large-index

Completed translation of "13-How large is your index" parts a and b. Resolves #240
c/implicancias/repercusiones
Merge pull request #238 from puentesarrin/issue-231

Completed translation of '09-Index_creation_options_sparse' into Spanish. Fix #231.