RFR: Fixed character encoding issues

[Jesper Wilhelmsson]

Removed invisible spaces that weren't actually spaces and told pandoc to generate ascii output. Also using iconv to
change the file encoding to Latin-1.

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Commit messages:
 - Fixed character encoding issues

Changes: https://git.openjdk.java.net/guide/pull/6/files
 Webrev: https://webrevs.openjdk.java.net/guide/6/webrev.00
  Stats: 40 lines in 19 files changed: 1 ins; 0 del; 39 mod
  Patch: https://git.openjdk.java.net/guide/pull/6.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/6/head:pull/6

PR: https://git.openjdk.java.net/guide/pull/6