add draft
lecture_09 code indenting improved
lecture_09 string operations were moved to a table

Good table with additional links to http://cplusplus.com/
lecture_09 freeing memory section is rewrited

link to a memory leak article
rephrazed sentences for simplification
space in `p -> next`
lecture_09 vector&string description is rewrited

+ links to documentation
lecture_09 string pass-to-function section is removed

- it will be tuned into a special section soon
lecture_09 pass-by-reference section is rewrited

- long code
+ string example
+ now it's about objects, not only about vectors
lecture_09 pass-by-reference was moved to class part

Reason: passing objects by reference is more general than just passing vectors or strings to function.
lecture_09 vectors = operator edit

+ link to documentation
+ dots at the end of each sentence
lecture_09 vectors = operator moved a bit higher

Reason: it is the most easily understood operation and should precede the difficult topics (vectors' inner perfomance).
lecture_09 vectors part edit
small additions
lecture_09 string operations table is recovered
add img copy_vector
fix bug trim_to_size()
Merge pull request #23 from razykov/add-lecture09

Add lecture09